Mine only go out for photo sessions in the front yard (front, not back, because the back is full of dog poo!). Even then, it's never more than 15 minutes to get plenty of good shots before they go back inside.
The only time I take snakes off my property is when they need to go to the vet (an hour and a half out of town) for some reason or another... If we have to make stops, the snake will often go in with me--tucked away in a pillowcase/bag/tub-in-bag... Though, for Petsmart/Petco stops, the snake in question will often be allowed to stay out and in my hands with the choice of hiding away in my coat sleeve.
The only reptile with different rules is the bearded dragon... He goes outside for any amount of time (always supervised) for natural UVB when it's warm/sunny enough. When he goes to the vet, he only leaves the car in his tub, and only if it's absolutely necessary.
If any of that makes sense, of course. I got no sleep last night and now I'm a bit hyped up on sugary ice cream... =3