I usually don't bother stripping at all, I wait about 21 days after I see her start holding, remove her to a separate tank, let her spit. If she looks overly thin, I put her in with previous batches in a grow out tank, let her get some food in her and put her back in the main tank. If I do strip, I also wait about that long, strip her and put her back in immediately. I don't have tumblers so I don't have that option, but I suppose if I did, I'd strip her after a week of holding and put her directly back in the tank.