My starters tend to be long for sure. Almost always over 1,000 words, sometimes over 2,000. I do find myself being the one to make the starting post most of the time as well - I've known a lot of people that have their reservations about it and I don't really mind either way so I've had a lot of experience grinding out OP's. Similarly, even if I'm the one to respond to the starter I treat it the same way where it still tends to be one of my longest posts. This is because I like to flesh out my characters a lot and normally I'll expand on whatever it was that they were doing before landing into the situation where they meet the other person's character for the first time.
That being said, I'm not gonna cry a river if someone doesn't make a gargantuan starting post. And if they do make one that's even longer than I would normally make, I'll try my best to match but will let them know that I may not be able to. Love reading talented writers' words though so I encourage people to make it as long as they want; I won't be annoyed or intimidated.
However, I won't lie, there's nothing that kills it for me more than when I type up a detailed starting post and get a small paragraph or two in reply. One of the worst times for me was when I wrote an almost 2,000 word starter and they came back with about 250 words in response... I just wasn't very motivated for the story after that, to be honest, haha.