Well my cat does that a lot and I get worried when he takes a lot of time without comming back but I know that cats are not stupid so I'm sure your cat won't go too far away. And when my cat runs away I comfort myself by knowing that cats know where their house is and thinking that if running away and living outside forever will make him happier than staying inside my house as a pet I will be happy too.
go to all of your neighbors with a pic... my cat ran away for 3 month so dont give up hope... he never came home beacause 2 diff neighbors were feeding him on their porches.... I worked alot so didnt have a lot of time to look for him... tried to leave food out but dont have an enclosed porch so all I attracted was skunks squirrels and raccoons.