....
It is really hard to predict, but I will leave at least 2 to 2.5 hours. I just went through LAX a couple weeks ago, and the whole process took about 2 hours (Fully loaded 777 arriving around 9 pm). The breakdown is as follows:
Deplane, walk to customs, pass thourgh customs and immigration - 40 min.
Wait for bags to show up at carousel - 25 minutes.
Drops the bags off at the connecting flight station - 15 minutes (only one agent on duty).
Walk to United terminal 7 - 15 minutes.
Go thorugh security check at United terminal - 20 minutes.
Walk to gate - 5 minutes