The EXP Guideline is 5 exp per hour of play. Now if we assume 4 hour play sessions, that's roughly 20 EXP a session. So if we assume weekly play, half a year is more 520 earned than 150, let alone an actual YEAR of play. Even Bi-weekly, We're looking at way more. I've got quite a bit of experience with SWRPG, and especially for Force users, 150 EXP is pretty far from being actual "Jedi Knights". Why they called it Knight level in the book? Beats me, tbh. The good thing about the system is that even at lower EXP you can usually pull of some pretty impressive things, and higher EXP mostly serves to make it more consistent, and unlock abilities to call on to make cool things happen through Talents and Force Powers.