I mean essential things like going to the loo, having a shower, making dinner, cleaning the kitchen etc etc etc..
Our darling 14 month old DS is an extremely active little boy and is into EVERYTHING. He can't be left alone for a minute unsupervised.
I do as much as I can during his morning nap, but other than that put him in his playpen - for no more than 20 mins-30 mins at a time (twice a day at most).
He doesn't mind it as much as he used to (tho he gets peeved off after a while) and I feel it forces him to play independently with his toys - which he rarely does otherwise as he wants to be with me all the time. (often causing havoc!)