You dont need to bring them back and forth to acclimate them..if possible just start them in a partially shaded area (bright indirect light, or a spot that only gets a couple hours of direct sun each day), after a few days you can move them to a sunny spot where they will stay,(assuming you would be starting them in smaller pots that you can move). If the days arent too hot yet you probably could even just start them out in the sun.
This.
Its not about hours of light, per se.
If you bring indoor plants outdoors in summertime, they will not be accustomed to the heavy amount of UV light and they'll literally get sunburn, killing the leaves.
The way to do it is exactly as above. Either bring them out for short periods of time, or put them in a place where they're not getting direct sunlight.
If its a time of year when UV isn't intense (ie late November or early spring), you can probably just put them outside and not worry about it any further.
And yeah. .. even if there were such a thing as Cherry pie ceeds (and there probably aren't), they're not going to be the same as the clone you know/like. If you have access to a clone, use it. If you grow it indoors now, you can top it into a good mother plant, and easily have many clones rooted and ready to plant by springtime.
