Start and end time, does not match process time


I am currently trying to plan production through the production schedule in Navision.

I create demand through a sales order, and makes a firm planned production order.

The order consists of 40 pieces.

When i go to the routing in the prod. order, i have fx. one process with the time of 1 minute. This should obviously take 40 minutes, but the start, and ending times says it will take 2h and 20 min.

Any idea why this?

I have capacity a 1 and effiency at 100% for the machine center.