Started a little to early I think ?

I have a few seeds that just sprouted. They are outside untill sunset and then there moved inside and put under light for a little bit. Thing is I can't veg to big of a plant inside. When can I leave them outside the whole time without worrying about them wanting to start to flower. I'm about 41°N . Or could I just leave them outside from now and will they be OK ?

I will be bringing them indoors if there's any threat of frost, after that there on there own.

Mid May

About how big might they get from now untill mid may ?

You have to have less than 10 1/2 hours of dark a night to keep them from going into flower. Look at https://www.wunderground.com/ and figure out how long your days are. If you can't keep them inside, running a light on them outside for a couple of hours around midnight will work to keep them vegging. It makes them think it is a new day and the night is short enough for them to keep on keeping on.

Says I am getting just about 13 1/2 hours of daylight. I'm sure daylight is prob a lil different than actual light I will get ? According to these time charts saying I am receiving 13 1/2 I should be OK ?

As long as you watch out for the frost seedlings will be OK. They can't flower until they are mature. Which takes a month or longer and by then the days will be long enough. A clone would most likely flower if put straight outside.