Beta girl.... GJ on getting in the pool. KEEP AT IT. It will get better.

As far as a good time? Well, you could check out the race results from the previous year to get a good idea of what the times were. Then, you can swim that distance in the pool and time yourself to see how you will do.

For my 1.2 mile swim, I did it in 40 minutes. But, I was also doing once a week swim workouts that totaled 2200 to 3000 yards each session. AND I was a competitive swimmer... 20 years ago!

Just do what you can... and feel good about being about to do it.