In the summer time I slowly work him up to about four to four and a half hours (twice a day) being out in the field. Making sure he doesn't get too much Spring grass. Right now though, it's just a snack, and a time away from his little barn. There's a problem though, he doesn't want to stay out there for more then 30 minutes. He doesn't like being out there by himself. I have a crazy horse- he gets to go out in a field with tons of grass, with no other animals to bug him or eat the grass before he can- and he wants to go back up to his yard. (Where he can see the goats.) He is actually not that far from the house at all. You can totally see it! We have a farther field and I have tried putting him out there and he doesn't like that at all. But, he does like being closer where he can see the house. Normally he likes to go out and graze but he goes in spurts where he doesn't.
He is all happy to go out there, then 30 to 40 minutes later is is running up and down the fence line.
Here is his view, from where I have him now.