We limit it for my son to close to zero, but he's 4. It's not hard: We just open the Legos loudly.

But what I really wanted to say in this thread is that I work online and I am online a lot. However, at home, my laptop keyboard broke and instead of replacing it I plugged it into a dock and use a regular keyboard at a desk, in a very inconvenient spot in our home. My usage of it other than at night after my son is in bed dropped a fair amount - not completely, but a lot. It was such a simple move.