Roughly how long do turtles take to reach full size from babies?
(something like a hieroglyphic cooter)

This is a question that has been asked a few times, and it's not really possible to give an answer because there are so many variables, diet, habitat, health, whether or not the turt hibernates etc...

And they never actually stop growing either, the growth rate just slows as they get older and they continue growing very slowly until they eventually die.

Something like a cooter might reach say 50% of it's full adult size in 5 years or so, but then another 10 years to reach 75%, maybe another 10-15 to reach 90%. But that's just an example and individuals might grow much faster or slower than that, there are too many factors involved to give a definite answer.

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2.3.0 Southern Painted Turtles
1.0.0 Florida Red Belly
2.1.1 Common Musks
1.0.0 Classic Cornsnake
0.0.2 GALS + infinite babies
0.1.0 Tibetan Spaniel
1.2.0 Brahma Chickens

Thanks for the answer thats just what I needed to know. Since I can't find the painteds I have to get something bigger like maps or cooters so I'll probably eventually need to move them to a pond but for the next few years I'm in a flat, so no pond building yet

A Cooter wouldn't be able to spend all year in a pond in this country (they tend to inhabit the warmer southern parts of America).....the same applies to maps, although I'd be quite surprised if a male map exceeded 6" (more like 5").

James is right, the more southerly species cannot be hibernated in the UK, our winters are quite mild but are too long, so you'd still need to provide indoor winter accomodation which would have to be the same size as if it were used year-round.

If size is an issue consider getting a male Map, obviously it would have to be at least a juvenile so you could sex it, or you could get Musks which don't grow to more than 4-5" anyway.

__________________
2.3.0 Southern Painted Turtles
1.0.0 Florida Red Belly
2.1.1 Common Musks
1.0.0 Classic Cornsnake
0.0.2 GALS + infinite babies
0.1.0 Tibetan Spaniel
1.2.0 Brahma Chickens