I find that if I post something I will get 50% of all likes and shares within 1 min, and 80% within 5 min. Makes sense that that's when it's at the top of everyone's feed, if you don't get lucky and find someone that engages it can get lost.

What I find strange is that when the post gets boosted it rarely gets much attention, even when it's not me boosting.

I think we all need to learn to boost posts that are a little buried, not posts that have just launched and are boosted by 10 other people.