You don't tell us whether you're growing autoflowers or photoperiods or what kind of lights you're using... but I can tell you if they're autoflowers, you have absolutely nothing to worry about! In fact, I grow all my autos under 24/7 lights because I need to keep the temps up, particularly at night when the ambient temperature in the room I've got my tents in is much lower than it is during the day. I could be wrong but I think folks went to an 18/6 light schedule way back when in order to try to contain their electric bills... with LEDs, cost is really not a consideration any longer and autos just don't care...
The other way to look at this is to say that one "mistake" is not going to ruin everything especially if all you're worrying about is the amount of light your plants got for 48 hours.... I don't have much experience myself but I DO know there are far worse "mistakes" to make...
Good luck with your grow and keep learning along the way!