I was just looking at someone I have raced against on strava, he had a Baby late Jan this year and has ridden over 11,000 miles this year. So yes it’s possible. I guess, from reading all the posts here and in some other rhreads though that it’s not that common.
The best thing from most comments seems to be rather than planning what you will do ahead of time, get into it and see what it is possible to do when your there, otherwise your just going to end up beeting yourself up if you can’t manage the training.