Originally posted by Ridley_PrimeThey've still got the "The more power you use, the less time you have" factor to contend with as we saw with Goku and his initial use of SSJ3, but I suspect that they'll either use this to tie up loose strengths (in order to get rid of Frieza) once the tournament is over or hand wave it entirely (i.e. Baba has changed the rules somehow).
Fixing his stamina issue aside, I would've assumed Frieza would naturally have more stamina now anyway since he's dead, which worked well with Goku being able to hold the SSJ3 form longer during the Buu arc. Being dead = the body can take moreSidra seems like the weakest GoD regardless of how he compares to Goku and them, yeah.
Personally, I'm hoping Frieza pulls enough strings to get himself appointed as a god of destruction of another universe, but we'll see. 😛