This has already been answered and could have been found by searching but here is the answer:
Goto character.inc
Find MaFl_Helper_ver12
Then edit each SetBuffSkill to the desired skill level, char level and buff time. The format is SetBuffSkill( <Skill Name>, <Skill Level>, <Min Char Level>, <Max Char Level>, <Skill Time in micro secs> );
so for one hour level 20 heap up you'd have:
SetBuffSkill( SI_ASS_CHEER_HEAPUP, 20, 1, 129, 3600000 );
Don't forget to update this is the res files after you change it.