I'll also note that this first 90 days is one of the places where us remote workers really lose. I've had 5 jobs in my career. For two of them I was in the office for (at least) the entire first 90 days, and for the others I was there about 4 to 6 weeks of that 90 days and working at home the rest. It's not crippling, but it definitely makes things harder. It also becomes crucially important to get some quality social time (read: drinking) in during those first weeks when visiting the office.