I have a love-hate relationship with 12s. I like them because I can get enough time off in between shifts, but I hate them because before I work I get anxious for getting enough rest the day before and then extra tired after a 1-2 12 hrs. Also, when I work 12s and really can do anything other than work. At least with 8s you have more time for activities. 5, 8 hours shifts suck though too. There is really no best bet unless you can afford to work part time...?
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