i don't roll for reps, i roll for time and reduced discomfort. start with a few slow rolls back and forth to find especially sensitive spots, then roll very slowly from end to end, stopping on the sticky bits. when stopped i'll sometimes move around on them, roll a bit in front and behind or on either side, move the corresponding joints around (so, e.g., when on a stick spot in ITB, i'll bend and extend my knee slowly -- this hurts). i try to move when i feel the spot getting less uncomfortable, although sometimes i get impatient and don't last that long. regular stuff is ITB, adductors, and thoracic spine with the foam roller, and t-spine, shoulders (at least traps and sometimes also a whole bunch of other shit including pecs, teres major/minor, delts, etc.), and hips with the peanut and/or lacrosse ball.
if i'm doing a "complete" or standalone SMR/mobility session that i plan to do for more than 30 minutes, i do all of those plus hamstrings, calves/peroneals, quads, and lats. i should be better about quads but that shit just hurts a lot and i'm a wuss.