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I think the route a lot of these types of students take is to take an extra semester or two to finish the degree. They are also probably students who either have massive school or familial financial aid so they do not have to work. You can take 15 credits and be in class 12 hours a week, in lab 5 hours a week, doing research 10 hours a week, studying 10 hours a week and volunteering 10 hours a week. Thats only 47 hours a week, so like a full time job with a night of on call once a week. Easy to manage that when you don't have to work. Heck, if they drop going to class and only do 5 hours of reviewing the lectures posted online or just self studying based on syllabus/study guide then you are down to 40 hours a week.Yeah but then again... SDN is filled with incredible applicants that maintained a 4.0/524 with 1000s if hours of volunteering
It truly makes higher education easier when you have nothing else to focus on like work or a family. Still not easy by any metric, but a lot more manageable if you don't have other obligations.
TL;DR - Don't worry about what other people say they got/say they are doing - you be as competitive as you can be at your pace of competitiveness. .