It's not a silly question at all, Ann.
I always went out with Ricky at that age. I was still trying to get him to think peeing in the grass was cause for a party! lol But, I'd play with him out there, check my gardens for weeds, have him race after me, then water my plants. I used the occasion to be semi-productive while still being with him.
When we got Sammy, they were both almost 8 months and for several months afterward, I still pretty much stayed out there, either on the deck watching them or down in the yard. I'd come in for a glass of water, or to answer the phone and then bring it out with me, but never longer than that.
This was a year ago, and they are now both 2 yrs. old and I do leave them out there on their own. I check every morning that the gate is latched and for the most part, let them do their thing out there while I'm in the house with an ear at the door or a peek from the window. We have no wild animals whatsoever here, so that's not an issue.
I do think 6 months is a bit young to trust out there on his own.