Depends on what your weather is like. If it is mild, not a whole lot of temp difference between indoors and out, then they just have to get adjusted to the bright sun and it doesn't take as long (but still at least five days). If outdoors is a whole lot colder/hotter than indoors, very dry or very windy, then it will take longer.
Water them as usual, but don't let them dry out between waterings.
When I first bring plants out, I put them in some very protected space with no direct sun and no wind. Day by day I gradually increase their exposure. If it is still very cold where you are, especially if there's any danger of frost, you might have to bring them back in at night. ( it always helps to tell us where you are located. There are hardly any garden questions that can be discussed without regard to location/ climate. )