Yes, no limit. But it currently doesn't work well with turbo tipping: it does undo the zap (it's more like a "zap abort" technically) but it leaves the UI in a wrong state if you undo in the "wrong order".

Currently working on fixing that including another visual bug related to it (no progress bar for custom zap undos). The code got pretty complicated for such a tiny thing. I thought we'd get zap undos basically for free thanks to how attached wallets are implemented lol