How realistic is it to work for two freelancing job at the same time as a fresh grad? A bit of a stupid question, but... 

I currently started my first ever job as a "Freelance Front End developer" for a startup company where I'm required to devote at least 6 hours a day but with flexible hours. Shit pay though.

I interviewed for another "freelance developer" for a big non-tech company where I need to devote 8 hours a day and with flexible hours. Great salary however.

My question is, if I accept both offers as a fresh grad with not much experience, how realistic is it to shit code 14 hours a day? Should I go for it or it's overkill?