I look at it like this, if you have a P120 restriction in an area, then in an 8 hour day (9.00am to 5.00pm), then turnover will be 8 hours divided by 120 mins or a turn over of 4. Best utilisation would be a turn of 85% of that being 3.4 turns in a day. If you have a P30 retriction, then in an 8 hour day, turnover will be 16 and best utilisaton would be 13.6 turns in a day. The turnover would then be the target. If we get lower turnover, then the restrictions are wrong, If we get higher turnover then the restrictions are wrong.... Would you agree?