well i had guessed it would take around 2.5-3 years before he would outgrow it, which is probably not far off for a freshy.
Once it outgrows the tank i will put him in an aviary in the shed with a big pond until it outgrows that, then i plan to build a false floor in a spare room in my house with a big pond and drainage etc, that should last about 10years, then might have to think about something permanent.
One member plans to deck out a triple garage for his salty.
I live in SA so putting them outside all year round is not really feasible since our winters get so cold.
Also, there are no regulations as to how big i can keep the guy. Basically in 20years time i will have a full grown adult freshwater croc as a pet in the backyard lol.