LEAP (Law Enforcement Availability Pay) is not a "bonus", it is mandatory overtime for those Federal agents actually performing law enforcement work. (Not all agents get it, depends on the job. And not all agencies have LEAP.)
You end up working five 10 hour days in a week, minimum. Your LEAP hours are tracked and some have to report quarterly. If you fail to maintain an average of 2 hours a day overtime, you lose your LEAP.
I wasn't ATF, but one year my LEAP hours were 3.98 for the year. After I realized that, I vowed to never do that much again. Family is too important, and the bad guys will still be there the next day.