I found this and immediately thought there was a digit missing. However reading on, it is a 1/8 share, but for 2 weeks this year and 6 weeks for onward years!
A share amongst 8? Not for me. Can only see a world of bickering with that. And knowing my luck the 6 weeks I get would be 3 in season and 3 out with both being marked by shitty weather which means I'd get about a week's use. No, far better to get a boat within your means and enjoy that exclusively. Helluva nice boat though. If only I was 8 times richer