For many women, the ideal schedule is working 20-30 hours per week. I’m a software engineer. I initially left the workforce to be a SAHM. After two years at home, I found a part-time contracting job, working from home, and loved my schedule. I kept mornings for time with my son (no rush to get out the door, and kids are in the best mood in the morning) then had a babysitter/nanny (a community college student) come from 12-5. She got to deal with some of the less-fun parts of caring for a toddler: making and cleaning up lunch, getting him down for a nap, and the late afternoon “witching hour”. The nanny also did some household chores like laundry and unpacking the dishwasher during nap times. I’d be done with work in time to have some fun time, feeling glad to see him, then make dinner and deal with the evening tasks like bath and bedtime.
Career wise, the downside was that I was only treading ground, not gaining new skills or climbing the ladder. I didn’t get the most interesting projects, but it was really enjoyable to focus on something intellectual for hours at a time. For me the sweet spot was 25 hours a week. When I did closer to 20, I felt I wasn’t getting enough done, when I did closer to 30 I felt pressed for time on the home front. I put 25% of my earnings into a SEP-IRA and those contributions are a nice addition to our FIRE savings.
Under 5 years old I wouldn’t recommend six months on/off. Little kids change so much during those months and you may feel you are missing out. You’re basically alternating between the downsides of being a full time working mom (time pressure and and constant juggling) and a full time SAHM (being 24/7 with kids can have stretches of mind numbing boredom and feeling oppressed by household tasks).
After two years working part time, I had twins and then stayed home for 8 years. My son turned out to have autism so that was my focus instead of my career. When he was 12 and the twins were 8, I was able to find another part time job, this time during school hours. This was another ideal schedule, as I could hang out with my kids after school.
Whatever you choose, I’d recommend reading the book “Fair Play” and making an effort to consciously decide all the kid and household responsibilities with you partner. If you are not vocal and proactive about it, you are likely to end up with an unfairly heavy share of the load. I’ll admit one of the reasons I chose to be a SAHM in the first place was that I didn’t want the life I was reading about that other working moms described (I had my first in the middle of the “opt out” trend in the media). I was pleasantly surprised by how much my husband stepped up when I returned to work the second time. If I had explicitly made plans with him to divide things fairly before my first child was born, my career would have looked much different, and we’d be closer to FIRE now.