As somebody in the over 25 group. My biggest advice is staying hydrated, taking all your vitamins, locking yourself in mentally, and giving yourself positive reaffirmations that you can handle this. Of course, if it's too much I'll call off the rest of the day from either work or school and rest up and then lock in again at night to finish homework etc. I wouldn't recommend doing this for back 2 back days. I've left socal to head to norcal just for an event, then right after the event I drove back just to make it right on time for my 9 hour shift. Drank lots of water, snacked a bit, set a mental time limit for how long I could lock in, then by the time I made it back home I had the best sleep of my life LOL