I doubt it. The plant needs at least a few days, if not a week, to recognize the light cycle change. Seal up that window, and you should be fine.
Faddenator Reviewed by Faddenator on . light leak on day 1 flowering! help I thought my room was light proof but I had a window leak some light on the first night of 12/12. Is there a good chance this will stress them enough to hermie? Rating: 5