I was a supervisor at my Megacorp job when I first switched from working full-time to part-time back in 2001. I went from 37-40 hours per week to 20 hours per week, making one trip per week to the office (working 6.5-7 hours) along with working ~13.5 hours per week from home. I did a lot of computer programs maintenance and other programming so it was better to do that from home during the off hours when staff was not in the office using the programs. Some of the other work I did I could not really do from home so that disappeared. I also was relieved of doing employee evaluations which was most welcome. Some computer work, however, I could not do from home because I could not gain access to it from home. That was awkward at times. Some of my telecommute work hours had to be during the regular work hours but some could be whenever I wanted. when things were slow, I would take some vacation time, as I did not want to just sitting around doing nothing while getting paid.
Over the next 7 years (2001-2008), I had other part-time work arrangements
after the telecommuting disappeared in 2003. I could still work 20 hours per week but I had to do them from the office, which I hated. The commute to the office was long and awful, so this was a big step backward. But when I was not in the office on those 3 days (each about 6.5-7 hours) I did not do any work from home, of course. I lost some of my bennies but most were intact.
After 3.5 years of that deal (in 2007), I asked to reduce my weekly hours worked from 20 to 12. This removed one day from my weekly commute and reduced my daily hours to 6 so I got home a little earlier. I also saw my workload get cut a bit more which was fine. Also, I ended up getting assigned to work on one large project which ate up most of my time at the office, leaving me with little else including supervisory duties, not that I cared. This was also fine, as it was a challenging but sometimes mentally exhausting project. To sweeten the deal for my bosses, I agreed to answer important emails on the days I was not in the office but would not do any programming work. This way, my coworkers would not have to wait 2 or 3 workdays to get a reply. I lost most of my remaining bennies incluidng eligibility for group health insurance (I went on COBRA) but remained in the company stock (ESOP) program, perhaps the most important bennie, even more than the health insurance.
I also knew when I got this reduction in hours I might very well leave the company by the end of 2008. I was starting to put my ER plan into shape in 2007 and the pieces were beginning to fall into place. So if I did not like this 12-hours-per-week arrangement, I would be able to make it the coveted zero-hours-per-week deal I always wanted. And that is just what happened. By the summer of 2008, the final pieces fell into place and I ERed at the end of October. I cashed out the company stock at high prices (before it fell a little in the 4th quarter) and bought into a bond fund at rock bottom prices. That fund's monthly dividends are my main source of income in ER.