So far I have been keeping my seedlings going at about 18 hours of light a day... When I transplant them to the outdoors is the light cycle from a real day going to effect the plants in any major ways?
Tricky question. Depends on how much sunlight you got where you live.
I took a Bubblicious from indoor 24/0 to outdoors where it was 13/11. It flowered, but in order to prevent it from re-vegging, I bring it into darkness after 12 daylight hours since the days are getting longer.