Earlier today, I took my two girls to play outside. As it wasn't too cold, and the kids next door were going out to play, I didn't see the problem. My husband stayed inside with our little guy. Figured it was better to keep him inside. Then, after a little while, my youngest daughter wanted to come inside. Around that time, my little guy started to get hungry, so my husband and I switched. I came in with our two youngest, and he stayed outside with our eldest.
My youngest was outside for about an hour, and our eldest for almost two. I think that it was about that time. I didn't really keep track.
Either way, I'm glad that they played outside. If they want to play outside, and if the weather permits, I don't have an issue with it. I think it's good for them to play outside, and get some fresh air. It's better than spending the day inside watching TV. I hope that they continue to want to play outside for a little. I think it's good for them.