Is it ok to have a few hours gap between the ceremony and reception?

I have friends and family travelling from overseas for the wedding. Day will start around 9ish with a bride pick up and wedding "gate crash" followed by tea ceremony and actual wedding ceremony around 12.30. Reception won't be until 6pm. Is that too long a break? My mum and rellies would like to refresh prior to reception and change clothes so they don't mind the gap but not sure what others will think...