When is my harvest time going to be?! HELP!

Hey guys, this is my first grow and my seeds are in the soil and I need to know when harvest time is goin be. Because im not going to be here this summer, I need to know if its ok to leave my plants for about 90+ days, I dont want to come back and them be died or worst. PLZ help.

I definitely wouldn't leave them for 90 days lol... also, did they just sprout or how far along are they?

90 days ... im guessing you have to be outdoors right ? if so they will be fine and harvest oct-november, indoors and they would be dead after 2 weeks without water

nature should take its course but verman and pests might destroy your shit unless looked after.

iv heard deer love that the taste of weed leave

Ya its outdoors, the seeds cracked this morning and they in some soil in a cup. I dont want to be away when its harvest time. Im going to put metal fences around them. My grandpa grows in his garden and he harvests around October, but he starts later than me.