diff --git a/src/modules/judge/judge/func.go b/src/modules/judge/judge/func.go
index 47e9e020..2e78b73c 100644
--- a/src/modules/judge/judge/func.go
+++ b/src/modules/judge/judge/func.go
@@ -24,11 +24,6 @@ func (f MaxFunction) Compute(vs []*dataobj.HistoryData) (leftValue dataobj.JsonF
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[count-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	max := vs[0].Value
 	for i := 1; i < len(vs); i++ {
 		if max < vs[i].Value {
@@ -54,11 +49,6 @@ func (f MinFunction) Compute(vs []*dataobj.HistoryData) (leftValue dataobj.JsonF
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[count-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	min := vs[0].Value
 
 	for i := 1; i < len(vs); i++ {
@@ -85,11 +75,6 @@ func (f AllFunction) Compute(vs []*dataobj.HistoryData) (leftValue dataobj.JsonF
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[count-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	for i := 0; i < len(vs); i++ {
 		isTriggered = checkIsTriggered(vs[i].Value, f.Operator, f.RightValue)
 		if !isTriggered {
@@ -114,11 +99,6 @@ func (f SumFunction) Compute(vs []*dataobj.HistoryData) (leftValue dataobj.JsonF
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[count-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	sum := dataobj.JsonFloat(0.0)
 	for i := 0; i < count; i++ {
 		sum += vs[i].Value
@@ -142,11 +122,6 @@ func (f AvgFunction) Compute(vs []*dataobj.HistoryData) (leftValue dataobj.JsonF
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[vsLen-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	sum := dataobj.JsonFloat(0.0)
 
 	for i := 0; i < vsLen; i++ {
@@ -171,11 +146,6 @@ func (f StddevFunction) Compute(vs []*dataobj.HistoryData) (leftValue dataobj.Js
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[vsLen-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	for i := 0; i < vsLen; i++ {
 		sum += float64(vs[i].Value)
 	}
@@ -210,11 +180,6 @@ func (f DiffFunction) Compute(vs []*dataobj.HistoryData) (leftValue dataobj.Json
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[vsLen-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	first := vs[0].Value
 
 	isTriggered = false
@@ -244,11 +209,6 @@ func (f PDiffFunction) Compute(vs []*dataobj.HistoryData) (leftValue dataobj.Jso
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[vsLen-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	first := vs[0].Value
 	isTriggered = false
 	for i := 1; i < len(vs); i++ {
@@ -315,11 +275,6 @@ func (f CAvgAbsFunction) Compute(vs []*dataobj.HistoryData) (leftValue dataobj.J
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[vsLen-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	sum := dataobj.JsonFloat(0.0)
 
 	for i := 0; i < vsLen; i++ {
@@ -347,11 +302,6 @@ func (f CAvgFunction) Compute(vs []*dataobj.HistoryData) (leftValue dataobj.Json
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[vsLen-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	sum := dataobj.JsonFloat(0.0)
 	for i := 0; i < vsLen; i++ {
 		sum += vs[i].Value
@@ -377,11 +327,6 @@ func (f CAvgRateAbsFunction) Compute(vs []*dataobj.HistoryData) (leftValue datao
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[vsLen-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	sum := dataobj.JsonFloat(0.0)
 	for i := 0; i < vsLen; i++ {
 		sum += vs[i].Value
@@ -408,11 +353,6 @@ func (f CAvgRateFunction) Compute(vs []*dataobj.HistoryData) (leftValue dataobj.
 		return
 	}
 
-	duration := int(vs[0].Timestamp - vs[vsLen-1].Timestamp)
-	if duration < f.Limit {
-		return
-	}
-
 	sum := dataobj.JsonFloat(0.0)
 	for i := 0; i < vsLen; i++ {
 		sum += vs[i].Value