Some turtles like to have their head or shells stroked, but most of them don't like to be held or touched. Water turtles are primarily a look-at pet. Turtles live 40 and more years. Turtles grow throughout their life. A slider needs at least a 20 gallon tank to be happy, and a bigger tank is better.
Outdoor setups are about the size of children's wading pools.
It takes about 1 hour a week to thoroughly clean the enclosure, and about 10 minutes a day to feed and observe your animal. This is not counting the occasional visit to the vet. Food will cost 10-20 dollars a month, depending on what you are feeding. An initial setup will cost you at least 50.-, but probably more. Budget about 1 dollar a day for one animal.