Alex I
Google
went on a weekend and there were alot of people around. the hike all the way to the top took around 2 hours, but we hiked along the pipe and was quite a steep climb, there are stairs for half the way up, and also there's the option to go on the street, but it would take much longer time wise. It got a bit cold once we got up the lake, had a quick lunch snack and came back down, view is amazing and it's really worth the hike.
Bring your ID or passport as military personnel might ask you for it near the top.