Missing feedings while away?

I EBF, but when my husband and i go on dates (say 5-8 hours long) & my mom feeds her bottles, will my supply get low? I dont have access to a pump say, at a waterslide park. Lol. So I got engorged but i pumped all the milk out as soon as i got home. Can it affect my supply going out & waiting too long to pump?