Anything to know about before going to the Ohel on 3 Tammuz (non lubavitch chossid here)
I've been there few times before just never on what I anticipate being a very crowded day?
The entry to the line is from the street down the block from the house where the regular entrance is.
They have a screen at the entrance with an estimate of how long you'll need to wait.
When you go in, they keep people walking, so all the time you have is however long it takes to slowly walk around (unless you come between 3-5AM, in which case they may allow more time).