Past two times I commuted were after taking about a month off and I felt dog tired after both times. Turns out I hadn't gotten so out of biking shape that I was worse off than when I had begun to bike again last year; I just had been some dumb as to not check my wheel alignment after my bike sitting idle for so long. I had done the commutes with my rear wheel rubbing the chainstay the whole time... I'm an idiot!