OohFeeshy
It's only forever; not long at all...
Well, I changed my 4.5 gallon to sand today. Guess how long it took? 45 minutes. That was to wash the sand, take out all the water in the tank, take out the gravel, put the sand in, put the water in, put the plastic plants and deco in and get everything running again. And it looks great! I will be getting real plants soon. All it took for the tank was one measuring jug full of sand. So don't sit there thinking about it! Do it!