Will the plants be affected when inline fan is not running

A question from a fellow grower:

i am new to growing. remember reading about temperature and humidity that affects plants. my seedlings are two weeks old and will be entering my grow tent (3x3x8) in a few days. have led for lights and will be vented with an inline fan. my question is, and i’ve never seen any reference to this situation, when i start the light cycle at 18/6, because of the humidity here in hawaii, will the plants be affected by the down time of six hours when the inline fan is not running? plants will be sitting in the grow tent until the next cycle begins. was wondering if it would be a good idea to have the fan on another timer that would cycle the air every hour until the 18 hour run time begins. your thoughts, please.

for a tent Yes or you could start “fox-tails” which is caused by excessive heat issues. Use trhu all stages of growth especially flower stage