I guess after breakfast, then after dinner. The cobsistency will help your brain get into the groove despite potentially 12 hour gaps between sessions.
If you have the sheer determination, good technique, time on your side, and a tennis court in your backyard/wall in the basement, you can do after breakfast, some after lunch, and then instead of after dinner, do more before dinner, then a half session before bed. 4 times a day. Thatll be enough to work in the muscle memory. That should be enough to overpower any lack of neuroplasticity too. That said, youre looking at an awkward schedule thatll leave you with a lot of laundry to do. So try not to sweat a lot I guess? This kind of schedule would be pretty bad if you pushed yourself, because its only for muscle memory. You would want the sessions to be easy, almost lazy. A few weeks of that and you wont be losing that muscle memory any time soon.