Yes, all day every day!
We have to send them in with at least 3 changes of clothes because everytime they come inside they get back into warm clothes (for snack, lunch, snack)
They come home sandy and exhausted, they Love being outside in the rain and the snow (particularly) but the summer is really where it is at. They have just done a summertime video which really shows the field at its best, they leave it long grass and mow little pathways into it so they can hide in it and make their own little adventurers. Its marvellous.