I got back into tris after 7 years off (ran for 4-5 of those) a year before having my first kid. I wanted to have “one last hurrah†before that big unknown.
It ended up sticking, and I’ve been training 2-5 hours/week through most of my daughter’s first year. I used to do 5-10 hr/wk when targeting a race.
Swim training is 90% with bands at home, and a couple pool swims before a race. Any week’s planned training or key ride/run workout may be thrown out the window at any time. I’ve got a 70.3 this year that I’ll be woefully unprepared for, by my old standards, but with some careful execution should be able to finish without bonking too bad. And I can’t wait for that. I’m as excited for that race as I used to be for any A race where I was chasing a PR.
I used to have a better time the better I executed a race, and would be bummed out if I was slower than expected, or if my training had gone poorly. I don’t care much about all that anymore. It’s been a process but these days I am just happy to be working out, keeping some baseline racing fitness, and having races to look forward to just as events to get out with my family and other triathletes and have a great time at.
I do still try to squeeze out minutes by training smart and playing around with bike fit and gear.
YMMV but this is working great for me. I keep pushing myself to get more training in but I don’t worry if it doesn’t work out. I feel like a triathlete in spirit even if I’m working within the limits of my life more than my body.
And as long as I’m keeping my fitness at this idle level, then when life lightens up a bit, I’ll be ready to add more hours and really target a race again.
As far as where you’re looking to get - you probably know this but it’s a slow process to build base fitness after taking 1+ years off (without getting injured). Especially when you’re past your 20s (38 here). Your mind inevitably thinks you can do more than your body can. Treat this like a couch-to-5k and use that to guide your volume. Don’t go run 5 miles your first week. Not even your 3rd week, probably. Do 1, 2, 3 mile runs and sprinkle in some easy biking… After 2-3 months of that madness, take stock of where you’re at and start adding miles and harder workouts. Find a 5k-to-half marathon plan. Somewhere around 4-6 months you should be good to dive back into what you used to consider a “real†training plan.
This all may seem like a grind, but if you take a lighter perspective on it all, it can be a really nice supplement to your life. Enjoy those 4-6 months. Then if you want to build after, you’ll be ready. Or if you want to just keep things on idle, keep fitness level modest but stable, and enter races for fun and not PRs, then I’d certainly recommend considering that, too.