Unfortunately when it comes to resources and resource leveling, P6 model is absolute. P6 doesn’t calculate the float correctly and the longest path will not be accurate since the late and early dates will not change after leveling.

Primavera P6 doesn’t take in consideration the new dates after the leveling in calculating the total float or the longest path, to illustrate further if we have a project consists of three activities A,B & C and they all share the same resource and each activity 5 days duration and the project completion after 15 days.