Yeah, IMO for the first couple of gyms it should be only 2 days, let's say the first 2 gyms (Cheren and Roxie). Then the next 3 gyms (Burgh, Elesa, and Clay) should be 3 days each since there's more content, then that last 3 gyms (Skyla, Drayden, and Marlon) should be 4 days since there's even more content. After that Part 9 inbetween the 8th gym and Champion can be 5 days since there's a ton of content there.
All agreed say I in your post. Once a unanimous vote has been reached, we will all have to stick by it.