My neighbours got me to look to water their huge garden while they were away, this is the last day I had to do it and of course I messed up. I need to turn on a sprinkler for 30 min to water their vegetable garden, which has carrots, beans, probably peas, probably radishes, and I don't know what else, but I went inside my house to check the time so I could turn it off after 30 min, but I forgot and it was on for a few hours (2?). I ran back and it was really wet. I mean 2 1/2 inches of water must've fallen, judging by the puddles on the ground. I know nothing about plants and seem to kill them just by looking at them, so I fear I messed up and killed their entire vegetable garden, which is huge. Did I kill them?

Ok so I went back to try to figure out what all the plants were, and I know for sure they have squash zucchini, peas, beans, carrots, and beets. The rest of them are a complete mystery. They're all little sprouts, too, if that makes a difference.

Everything will probably be fine. I've done the same thing. Unless I carry a phone on me and set the timer on it, I never remember.

It would be the same result if there had been rain for an hour or two. The garden probably appreciates the extra water!

Where are you, and what's the soil type?
If sand, you're probably fine, if clay, it could well have drowned everything.

It always a trip how people drown their gardens during the drought... It happens.

Maybe go to the big box store and look at timers....

No worries. I can't even count how many times I've done the same thing. Left zero water in the holding tank many times since on a well. I finally added timers on all the ends of hoses and set for the amt of time needed so they automatically turn off. In other areas used gallon setting timers on the ends of hoses turns off after say 12 gallons of water has been used.
At least I have water left for dinner and a shower!

I agree. Not a problem.