Thank Reddy,
I know the concept but the fact is quite weird regarding the pick/pack time and day. The pick/pact time doesnt impact to schedule at all as I tested (you have same conclusion as well if I am not wrong) so I tried to use pick/pack wdays but 8 hours divide for 24 hours is unlimited decimal number so I used 0.33 for temporary but it doenst work at all.
I might have to use enhancement for this case. Many thank for your idea.