So if I'm in the middle of an expansion, then I go to my arctic isles where I CAN request maps. It's the only reason I go to arctic isles.
And here's where I like to be in control of how many maps are coming out. I don't want to squander valuable maps on expanding my arctic isle. So if I have say 60 out of 64 maps I request only 4 maps. 5 at the most. Then when I go to arctic isles I won't have enough to expand there (I think I only need 9 there) then I can ask 20 of my neighbours.
By the following day I will be able to start expanding another block on my main isle.
Don't forget that at 64 maps and only receiving 20 a day that's more than 3 days worth and less than 4.
I'm level 81