Time Between Ceremony and Reception

Hi there! Our wedding is just a little over 3 months away, and we are starting to get the day-of timeline hashed out. We are thinking about starting our ceremony at 3pm. It is outdoors at the same site as the reception. FH and I are not doing a first look, so we'll need time afterwards for pictures. We were thinking that the ceremony would get done around 3:30pm, then we would di pictures from 3:30-5:30pm. We would have cocktails and appetizers, along with lawn games and a few other activities (the venue is on a ranch and has lots of open grass) for guests in that downtime, then start dinner around 5:30pm. We've had a few family members comment that 2 hours is too long to make guests wait. I don't think this is terrible. Thoughts and/or advice?