Mostly thinking about how long of a connection to book while having enough time to comfortably enjoy a salad or two without being rushed or lounging around too long.
If you look up SNAFU in the dictionary there will be pictures of U.S. Border Control and TLV security procedures. It may be a breeze if you arrive at the right timr, it may be a long march if passport control machines are broken and an employee may randomly cut your time in half by deciding to rearrange things.
When waiting in the queue it is good to remember the words of a famous philosopher:
Hope (of lounge time) is the last thing that dies in man.