diff --git a/app/src/components/Sidebar/ValueRenderer/MessageHistory.tsx b/app/src/components/Sidebar/ValueRenderer/MessageHistory.tsx
index 6e6fc5f..4b2f3d5 100644
--- a/app/src/components/Sidebar/ValueRenderer/MessageHistory.tsx
+++ b/app/src/components/Sidebar/ValueRenderer/MessageHistory.tsx
@@ -68,7 +68,7 @@ class MessageHistory extends React.Component<Props, State> {
         title: (
           <span>
             <DateFormatter date={message.received} />
-            {previousMessage ? (
+            {previousMessage && previousMessage !== message ? (
               <i>
                 (-
                 <DateFormatter date={message.received} intervalSince={previousMessage.received} />)
diff --git a/app/src/components/helper/DateFormatter.tsx b/app/src/components/helper/DateFormatter.tsx
index fb9629d..569b108 100644
--- a/app/src/components/helper/DateFormatter.tsx
+++ b/app/src/components/helper/DateFormatter.tsx
@@ -20,7 +20,7 @@ class DateFormatter extends React.Component<Props, {}> {
   private intervalSince(intervalSince: Date) {
     const interval = intervalSince.getTime() - this.props.date.getTime()
     const unit = this.unitForInterval(interval)
-    return `${moment.duration(interval).as(unit)} ${unitMapping[unit]}`
+    return `${Math.round(moment.duration(interval).as(unit) * 100) / 100} ${unitMapping[unit]}`
   }
 
   private legacyDate() {