diff --git a/src/components/TimedOrderEntry.vue b/src/components/TimedOrderEntry.vue
index b0c132c..b95bbd9 100644
--- a/src/components/TimedOrderEntry.vue
+++ b/src/components/TimedOrderEntry.vue
@@ -255,8 +255,8 @@ async function placeOrder() {
   // build tranches
   const n = tranches.value // num tranches
   const ts = []
-  let duration = timeUnitIndex === 0 ? interval.value * 60 :  // minutes
-      timeUnitIndex === 1 ? interval.value * 60 * 60 :        // hours
+  let duration = timeUnitIndex.value === 0 ? interval.value * 60 :  // minutes
+      timeUnitIndex.value === 1 ? interval.value * 60 * 60 :        // hours
           interval.value * 24 * 60 * 60;                      // days
   let window
   if (!intervalIsTotal.value) {
@@ -269,9 +269,11 @@ async function placeOrder() {
   const ceil = oneHundredPercent % BigInt(n) ? 1n : 0n
   const amtPerTranche = oneHundredPercent / BigInt(n) + ceil
   duration -= 15  // subtract 15 seconds so the last tranche completes before the deadline
+  console.log('duration', duration)
   for (let i = 0; i < n; i++) {
-    const start = Math.floor(i * (duration / n))
+    const start = Math.floor(i * (duration / (n-1)))
     const end = start + window
+    console.log('tranche window', start, end, (end-start)/60)
     const cs = [newTimeConstraint(TimeMode.SinceOrderStart, start, TimeMode.SinceOrderStart, end)]
     ts.push([amtPerTranche, cs])
   }