I think it would be fair for children to have leisure time outside and inside. So 5 minuets outside to play tag, running around or enjoying the sun shine. So yes I think children should spend part of their leisure time doing what ever they would like.
Inside is a good time for you to be calm and try not to be running around just reading books or drawing or even sleeping. That could be another 5 minutes for you to relax. Altogether 10 minuets of your free time inside then outside. So yes I agree, you should have 5 minutes in and another 5 minutes out.