Last time we were there, it took us about 2 1/2 hours to hike the long loop trail.
There are several different paths available to walk. The longest takes about 3 hours while the shortest could be about 30-45 minutes. You can walk however long you'd like though and just turn around and head back when you please.
It depends on which trail you are walking. It's 3/4 mile to Russell Lake via the red trail. The whole red trail is 2.5 miles. If you choose to hike further, the yellow trail is 3.6 miles. So the combined red and yellow trail is a 6 mile hike. There is a picnic table at Lake Russell, and benches in several places along the red and yellow trail.
Thanks! Your answer is awaiting moderation.