user prefence deafult time period

Hello ...to All.

i am a new user of P6 ..

i am using a two diffrent project cleander one for engineering depart. as they are working for 8.0h/d and other for construction Labours they are working for 10H/d

1. cleander 8.0h/d
2. cleander 10h/d

However User Prefence deafault setting 8.0h/d if i will make it 10h/d then engineering cleander 8.0/d work time will be not same as my user prefence..

There is any common setting in P6 alow me to perform my work in correct way. or i have to change my user prefence accordint to my cleander.

Your advise most valuable

kind regards
shahzad