But if you don’t work on it, how could you come back to tell yourself that it works? ;-)
I am hosting a time travel meeting. Meet here last Tuesday at 6pm.
Just use the time in between the time when old me shows up and tells me it works, and when I am old and using the time machine, to build it. There's got to be several years there. And the older I get before the older me shows up, the more I would appreciate if I show up with some schematics or something, because I think I am already kind of cutting it close.