diff --git a/src/components/chart/DCABuilder.vue b/src/components/chart/DCABuilder.vue
index 2fae81b..8c69c52 100644
--- a/src/components/chart/DCABuilder.vue
+++ b/src/components/chart/DCABuilder.vue
@@ -110,12 +110,8 @@ const parts = computed({
     v = Number(v)
     v = Math.max(1, Math.min(1000,v))
     props.builder.tranches = v
-    let interval = (props.builder.endTime-props.builder.startTime) / v
-    if (interval < 60) {
-      interval = 60
-      props.builder.endTime = props.builder.startTime + interval * v
-      setPoints(null, true)
-    }
+    props.builder.endTime = props.builder.startTime + props.builder.interval * v
+    setPoints(null, true)
   }
 })
 
@@ -153,7 +149,14 @@ const displayedInterval = computed({
 })
 
 const timeUnits = [['minutes', 60], ['hours', 3600], ['days', 86400]]
-const _timeUnitIndex = ref(0);
+function defaultTimeUnit() {
+  let i=1
+  while( i < timeUnits.length && props.builder.interval >= timeUnits[i][1] )
+    i++
+  console.log('defaultTimeUnit', props.builder.interval, i-1)
+  return i-1
+}
+const _timeUnitIndex = ref(defaultTimeUnit());
 const timeUnitIndex = computed({
   get() {return _timeUnitIndex.value},
   set(v) {_timeUnitIndex.value = v % timeUnits.length}