More Green For Less Green
Do you have the kind of job where it could be easy to end up staying longer than you intended? A client calls? A boss wants a meeting? and before you know it a 5 hour day has turned into 6 and then 7?
I would rather work the full days and then I'm free to do what I want the rest of the week.
I went back part time - and started out 2 full days in the office. Honestly, for me, it sucked. LO reverse cycled because she wouldn't take a bottle and we were breastfeeding. I would come home and she would be attached to my boob all night long - and literally for a full 2-3 hours right when I came home, then nursing all night long because she hadn't eaten all day. Then, right when she was getting back on a normal schedule I had to go back in. I had a really hard time doing it but did it for a few months, then renegotiated my schedule.
I went from that to working from home every day for 2 hours and going in the office 2-3x a week for 3-4 hours at a time. There were a few days where I had to work full days, and DH brought LO in for lunch time so that I could nurse her. (DH was a SAHD)
I would much rather only be away from my LO for short chunks when they are tiny, but now that she is almost 2 I would rather do the 2 full days and get it over with. Luckily, I found another job (better) and work from home full time now.
I used to work part time days (15-20 hours a week) and I liked doing 5 short days. I had some flexibility in scheduling because I had family to help so I'd work around when activities I wanted to do with the kids were. Work was more of a break instead of dreading being away from my kids for 8 hours. Workwise, it was easier because other employees/managers needed my assistance a lot (I worked in HR) so they were able to catch me on any weekday and I found working less days made me fall behind easier.
I guess it really depends on what your role would be. It might be easier if you're doing more independent work to get it all out of the way on 2 days instead of focusing half your day on work/half your day on baby. If other coworkers rely on you, it might be easier for you to do 4-5 days a week.