diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 4cac9cd8bc..8f2d98195c 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -667,9 +667,10 @@ var (
 		Usage:    "Disables db compaction after import",
 		Category: flags.LoggingCategory,
 	}
-	LogSlowBlockFlag = &cli.Uint64Flag{
+	LogSlowBlockFlag = &cli.DurationFlag{
 		Name:     "debug.logslowblock",
-		Usage:    "The block execution speed threshold (Mgas/s) below which detailed statistics are logged",
+		Usage:    "Block execution time threshold beyond which detailed statistics will be logged (0 means disable)",
+		Value:    ethconfig.Defaults.SlowBlockThreshold,
 		Category: flags.LoggingCategory,
 	}
 
@@ -1716,7 +1717,7 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 		cfg.LogNoHistory = true
 	}
 	if ctx.IsSet(LogSlowBlockFlag.Name) {
-		cfg.SlowBlockThreshold = ctx.Uint64(LogSlowBlockFlag.Name)
+		cfg.SlowBlockThreshold = ctx.Duration(LogSlowBlockFlag.Name)
 	}
 	if ctx.IsSet(LogExportCheckpointsFlag.Name) {
 		cfg.LogExportCheckpoints = ctx.String(LogExportCheckpointsFlag.Name)
@@ -2303,7 +2304,7 @@ func MakeChain(ctx *cli.Context, stack *node.Node, readonly bool) (*core.BlockCh
 		StateSizeTracking: ctx.Bool(StateSizeTrackingFlag.Name),
 
 		// Configure the slow block statistic logger
-		SlowBlockThreshold: ctx.Uint64(LogSlowBlockFlag.Name),
+		SlowBlockThreshold: ctx.Duration(LogSlowBlockFlag.Name),
 	}
 	if options.ArchiveMode && !options.Preimages {
 		options.Preimages = true
diff --git a/core/blockchain.go b/core/blockchain.go
index b9ffd8283e..7fe39e2b65 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -199,9 +199,9 @@ type BlockChainConfig struct {
 	// StateSizeTracking indicates whether the state size tracking is enabled.
 	StateSizeTracking bool
 
-	// SlowBlockThreshold is the block execution speed threshold (Mgas/s)
-	// below which detailed statistics are logged.
-	SlowBlockThreshold uint64
+	// SlowBlockThreshold is the block execution time threshold beyond which
+	// detailed statistics will be logged.
+	SlowBlockThreshold time.Duration
 }
 
 // DefaultConfig returns the default config.
@@ -341,8 +341,8 @@ type BlockChain struct {
 	logger     *tracing.Hooks
 	stateSizer *state.SizeTracker // State size tracking
 
-	lastForkReadyAlert time.Time // Last time there was a fork readiness print out
-	slowBlockThreshold uint64    // Block execution speed threshold (Mgas/s) below which detailed statistics are logged
+	lastForkReadyAlert time.Time     // Last time there was a fork readiness print out
+	slowBlockThreshold time.Duration // Block execution time threshold beyond which detailed statistics will be logged
 }
 
 // NewBlockChain returns a fully initialised block chain using information
diff --git a/core/blockchain_stats.go b/core/blockchain_stats.go
index 58726895e5..0cebebc20a 100644
--- a/core/blockchain_stats.go
+++ b/core/blockchain_stats.go
@@ -99,16 +99,16 @@ func (s *ExecuteStats) reportMetrics() {
 }
 
 // logSlow prints the detailed execution statistics if the block is regarded as slow.
-func (s *ExecuteStats) logSlow(block *types.Block, slowBlockThreshold uint64) {
-	if slowBlockThreshold == 0 || s.MgasPerSecond == 0 {
+func (s *ExecuteStats) logSlow(block *types.Block, slowBlockThreshold time.Duration) {
+	if slowBlockThreshold == 0 {
 		return
 	}
-	if s.MgasPerSecond > float64(slowBlockThreshold) {
+	if s.TotalTime < slowBlockThreshold {
 		return
 	}
 	msg := fmt.Sprintf(`
 ########## SLOW BLOCK #########
-Block: %v (%#x) txs: %d, mgasps: %.2f
+Block: %v (%#x) txs: %d, mgasps: %.2f, elapsed: %v
 
 EVM execution: %v
 Validation: %v
@@ -118,18 +118,17 @@ Account hash: %v
 Storage hash: %v
 DB commit: %v
 Block write: %v
-Total: %v
 
 %s
 ##############################
-`, block.Number(), block.Hash(), len(block.Transactions()), s.MgasPerSecond,
+`, block.Number(), block.Hash(), len(block.Transactions()), s.MgasPerSecond, common.PrettyDuration(s.TotalTime),
 		common.PrettyDuration(s.Execution), common.PrettyDuration(s.Validation+s.CrossValidation),
 		common.PrettyDuration(s.AccountReads), s.AccountLoaded,
 		common.PrettyDuration(s.StorageReads), s.StorageLoaded,
 		common.PrettyDuration(s.AccountHashes+s.AccountCommits+s.AccountUpdates),
 		common.PrettyDuration(s.StorageCommits+s.StorageUpdates),
 		common.PrettyDuration(s.TrieDBCommit+s.SnapshotCommit), common.PrettyDuration(s.BlockWrite),
-		common.PrettyDuration(s.TotalTime), s.StateReadCacheStats)
+		s.StateReadCacheStats)
 	for _, line := range strings.Split(msg, "\n") {
 		if line == "" {
 			continue
diff --git a/eth/ethconfig/config.go b/eth/ethconfig/config.go
index 2c916aadde..d6ed2c2576 100644
--- a/eth/ethconfig/config.go
+++ b/eth/ethconfig/config.go
@@ -72,6 +72,7 @@ var Defaults = Config{
 	RPCTxFeeCap:          1, // 1 ether
 	TxSyncDefaultTimeout: 20 * time.Second,
 	TxSyncMaxTimeout:     1 * time.Minute,
+	SlowBlockThreshold:   time.Second * 2,
 }
 
 //go:generate go run github.com/fjl/gencodec -type Config -formats toml -out gen_config.go
@@ -120,7 +121,7 @@ type Config struct {
 
 	// SlowBlockThreshold is the block execution speed threshold (Mgas/s)
 	// below which detailed statistics are logged.
-	SlowBlockThreshold uint64 `toml:",omitempty"`
+	SlowBlockThreshold time.Duration `toml:",omitempty"`
 
 	// Database options
 	SkipBcVersionCheck bool `toml:"-"`
diff --git a/eth/ethconfig/gen_config.go b/eth/ethconfig/gen_config.go
index db4cd740c2..97c5db3ecd 100644
--- a/eth/ethconfig/gen_config.go
+++ b/eth/ethconfig/gen_config.go
@@ -33,7 +33,7 @@ func (c Config) MarshalTOML() (interface{}, error) {
 		StateHistory            uint64                 `toml:",omitempty"`
 		StateScheme             string                 `toml:",omitempty"`
 		RequiredBlocks          map[uint64]common.Hash `toml:"-"`
-		SlowBlockThreshold      uint64                 `toml:",omitempty"`
+		SlowBlockThreshold      time.Duration          `toml:",omitempty"`
 		SkipBcVersionCheck      bool                   `toml:"-"`
 		DatabaseHandles         int                    `toml:"-"`
 		DatabaseCache           int
@@ -137,7 +137,7 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 		StateHistory            *uint64                `toml:",omitempty"`
 		StateScheme             *string                `toml:",omitempty"`
 		RequiredBlocks          map[uint64]common.Hash `toml:"-"`
-		SlowBlockThreshold      *uint64                `toml:",omitempty"`
+		SlowBlockThreshold      *time.Duration         `toml:",omitempty"`
 		SkipBcVersionCheck      *bool                  `toml:"-"`
 		DatabaseHandles         *int                   `toml:"-"`
 		DatabaseCache           *int