Personally, I don't encounter such problems (but I also experience Facebook issues in about 10% of cases, as I don't play Jebs). But in general, if players report such a problem, it means it exists. In my opinion, all that remains is to find a "golden mean" that wouldn't restrict actions but also wouldn't accelerate Facebook too much. I think it should be something around 20-30 minutes + 1 minute additional time.

P.S. And yes, adding a timer for Facebook is another step towards the esports aspect.