If this helps we fly Delta out of LGA, and like the other post , there is very little room for long lines. Sometimes the two lines almost meet in the middle.
Do yourself a big favor, allow extra time. If you miss your flight the additional time you spend in the airport is going to be alot more than an hour.
We flew 3 times last year Thanksgiving, Christmas, and Presidents Week. Different airlines, different airports, it is a roll of the dice, one security line can be empty and the other can have a long line. Hope this helpes