Can't do that. My th will upgrade just 2 hours before spell. And I need a th lvl to upgrade my lab.
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Sound advice.
Couple of notes.
My experience is that it's a little buggy when the lab finishes. The research takes a few minutes to complete and I typically have to close the game, wait a couple minutes, and come back.
Also, if you start something that should finish while the lab is still upgrading, that upgrade will not be unlocked until the lab is done.
I will glitch or whatever, you need to login, log out then login again to instantly finish it (if it's over).