[topynate]

Hm, I'd try timing the request so that it's the middle of the night wherever the thief lives. Try once assuming that he lives in America, once assuming Eastern Europe.

[deadmik3]

This may not be the quickest result, but the basic idea of just trying & trying & trying... until you eventually beat the hacker sounds almost like a game.

[toxicFork]

What if the hacker tells google that OP's other non-hacked email "has been hacked" and to please unlink it from the hacked account? :D

[leopoldo]

Game over :/

[Implicated]

Unless they've scripted the process to open password reset emails and follow the cancel link.