0.7 was a hair under 8 months, 0.8 a hair over 9 months. So I think the current devtime is more like 8-9 months.
Probably safe to say the days of 7 month developments are over, especially when the latest one was the biggest update. While he doesn't need to make the next one the same size, the bar was set to new heights so it's kind of human nature to feel like if you don't get at least close, people will be disappointed.
Heck, I doubt 0.8 ends up being the biggest update when it's all said and done.
So if the next one comes out August-September, then the one after that would be around May of 2026, which means only 7 months until it's 2027.
To me it's looking like we'll only get 1 update per year the next two years. Then we'll see what happens in 2027.