Your 18th birthday can last as long as you’d like! Typically, we don’t see an end time on invitations at this stage. If you’re having a movie marathon, it might last for around four to six hours.
If you’re having a house party, it might start at 8 p.m. and continue into the wee hours of the morning. The length of the party depends on your activities, the vibe of the celebration, and your wishes!