I'm married and we're sort of taking a phased approach. We planned A LOT, tracked our spending for several years, estimated and re-estimated anticipated retirement spending/budgets, and read A LOT. After all of this, we have opted for a quasi-OMY approach.
My DW retired Jan of this year, while I continue to work (we both earned approx the same income). The idea is that we're going to test drive our anticipated retirement budget in 2020, figure out what we got right/wrong, and if we wished we would have saved more.
If it goes well, I'll likely phase into semi-retirement sometime next year. I'm still planning to work part-time semi-retirement jobs for 2-4 years after that. That would be another phase of the plan, and while we likely won't need the income, it won't hurt and I think I might actually like to phase-out of the work world rather than simply cut it off entirely.
If it doesn't go well this year, I plan to continue working my career job until the numbers add up. My profession is very secure and I'm confident I can work as long as I like.
If it goes exceptionally well, I might join DW in full retirement next year, though that seems unlikely to me. For one thing, this virus has already thrown a wrench in that idea. Currently we're spending well below our anticipated budget, but I attribute much of that to the lack of spending opportunities during lock down and so I don't completely trust the numbers. Also, we're doing well on the investment side of the ledger, but who knows how the rest of the year will play out.