Leveling in Primavera P6 is taking too much time

try doing this by hand and see how long it takes you maybe running out of space the 4 gig space limit 

If the schedule is really large and complex ten minutes does not look too slow. 

How many resources and how are distributed among competing activities can be a significant complicating factor that makes it very hard to estimate resource leveling duration.

Out of curiosity how many activities is the schedule?

Hand/manual leveling the schedule requires a tedious process where the scheduler systematically delays some activities until all resource overloads are erased. It can be very difficult to discern if the soft logic used is interfering with the optimum solution for resource leveling. 

Updating the hand leveled schedule is even more tedious as it requires erasing all “soft dependencies” or there is high risk the updated schedule will be far from optimal, only after removing the old/temporary "soft dependencies" is that manual leveling can proceed.  Comparing computer times without taking into consideration the abysmal difference in time it takes to resource level and update the schedule if using manual versus automatic methods is myopic.

It would be naive to believe the average scheduler will get better alternate schedules if using “soft logic” than if using modern resource leveling algorithms on schedules with resources and activities count in the thousands.

Hallo,

Thank you for your replies.

I found the solution, the issue was in calendars that belong to other project. So what I had to do is reassign own project calendars.

Best Regards,

indeed!

https://www.planacademy.com/primavera-calendars-change-durations/

https://www.planacademy.com/5-things-know-primavera-p6-calendars/

http://www.primaverascheduling.com/calendar-issues-in-primavera-p6/

https://www.planacademy.com/primavera-p6-calendars-biggest-problem/