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Athlinks / Strava
You'll be able to cover the distance comfortably with your normal IM swim training plus a long swim every week or two. Maybe build your long swim progressively to 7 or 8 km, but you wouldn't have to do more than two swims that long.
It really depends how quickly you want to go on race day and how strongly you want to finish the final mile. More training = faster time. No need to overthink it.
Swimming has always been my weakest leg, but a swam an open water 8 km only a week after my first IM. No special training, not even any squad swimming, though of course it was slower than it would have been had the race been a couple weeks later.
Three years ago I decided to enter a 10km ocean swim. At the time, I hadn't been doing any regular swim training for many years, even going for a year between IM races without getting in the pool, just doing a couple of shorter tris and a couple of 2km ocean swims as my IM prep.
I had a 4 month lead in to the 10km, so I started swimming about 3 or 4 days/week. Within 3 or 4 weeks, my weekly long swim was 6 km and I headed headed down to the beach for my first swim with a large casual ocean swimming group that heads out every morning. I joined them for 2.5km and after the swim, one guy mentioned they were having their monthly 6km and a 10km the following day. A perfect way to get in my planned 6km swim for that week! Except the following day I ended up continuing on and swimming the 10. Suddenly my 10 km event in 3 months looked eminently achievable.
As I say, don't overthink it.
Which 10K are you signed up for? Sadly there aren't a whole lot to choose from!
I swim year round with no layoffs. Most weeks about 12,000 yards. I strive to not dip below 10,000. I'm not super fast, typically swim 2.4 miles in 60-65 minutes. My three 10k swims were all done on normal balanced Ironman triathlon training. For context, I've done 25 Ironman distance races since 1996. My 10k swim times were all between 2:45-2:50.
Of the two swims across Mobile Bay, neither effort was a sanctioned race just a fun effort with the support of a generous friend with a boat. The first year we had a group of 5 and we swam it relaxed, no sense of urgency. We just covered the distance. Last year me and a buddy swam it fairly aggressively and swam the 11.75 miles in 5:39. He and I are swimming it again on Sunday, it should be a lot of fun.