Go back in time before your cup of coffee went cold.

Go back in time to get the first reply to this topic.

Go back in time to just before the topic was originally posted, and post it myself, becoming the original poster of this topic.

Watching Nolan's "Tenet" for the first time recently, reconfirmed my belief that time machines/time travels are a lame concept per se.
Travelling into the past can never work.
The only way to travel through time is to go on with your life.
When you see the sun go down in the evening and up again in the morning, you know you made it - you travelled another day into the future. Congratz!

I'd go back in time to fill up at the gas station I passed over earlier today and the gas was a whole 3 cents cheaper than the station I ended up stopping in.

I'd also go back to when I threw away the rest of a paint can only to need a few extra brush strokes a few days later, and stop myself from throwing it away.

Finally, I'd use the time machine to stop myself from buying some games that are in my backlog but I know I will never play.
(which is lame because I could go back in time to have extra time to play everything in my backlog instead)

Funny, that's exactly how HunchBluntley took over the OP, too.

You can speed this up by traveling at near the speed of light. This will allow you to travel arbitrarily far in the future within your lifetime.

(See Einstein's theories of relativity for the details.)

How about this: as soon as you tell me how I manage to travel with the speed of light, I'll do it.

You don't actually need to travel at the speed of light. Choose any finite time dialation factor, no matter how large, and I can tell you how close you need to be to the speed of light.

(Actually, one constraint: The factor must not be too large for math to be effectively performed on it. Then again, any number that large is, for practical purposes, infinite.)

Just thought of another lame use: I use it to travel forward one second.

Go forward an hour, to set the clocks back 1 hour...

Go back in time to create weird time paradoxes and see how they resolve themselves. Like go back in time to steal the time machine you used to get back in time to, then take both back to the preset. Who needs the time continuum.