I almost never go for 45 mins for FS, value-wise for me it's either 30 mins or 1 hour (a hot girl with good ARs), 30 mins = 1 shot, 1 hour = enough time for 2 shots and not feel rushed, but these days I mostly go for 30 mins for FS, Rnt I usually go for 1 hour (unless it's the 1st time I'm seeing a ML, then maybe 30 mins to scope things out).
Shower before you get to the shop (if possible), I usually tell the girl I already had a shower before I left and then I just jump in the shower for a quick one (1-2 mins), if the girl shower with you minimise the shower play unless it's a thing for you, the last thing you wanna do is blow your load in the shower lol, you wanna get out and on to the main event, once you are out, skip the catbath, it's a trick WL likes to use to waste time (for short sessions at least), for 30 min sessions you don't have the luxury for too much foreplay, it will be less erotic, more robotic and fast paced, and if you feel pressured in anyway, e.g. feel like you need to cum in a short amount of time, it's already game over...