In one sample semester, I worked 8:30a - 5:00p M-F, A&P on Tu/Th night (with lab until 10 one night), Microbiology on Saturday. Volunteering on Mon from 5:30 - 9:30p.
How did I deal? Discipline about getting certain tasks done on certain days and prioritization. Friday nights & Sunday were typically catch up days, not "days off." Little efficiencies can add up - for example, packing dinner with me in the morning was essential to getting places on time & being able to concentrate when I got there.
You know how your profs in undergrad said that you would need 2+ hours of study for each hour in class? I only really got close to that number for A&P and O Chem. OTOH, nearly every class is that way in pharma school so far... With 24 hours a week just butt-in-the-seat time in class, plus ~4 hours of exams each week, you can do the math.