How long does it take for a remote community to federate?

I've just subscribed to https://sopuli.xyz/c/y2k, and now refreshing its local representation here at https://lemmy.ml/community/18886, but still no content. Will continue refreshing and will update this post as soon as I see the content reached this instance, but anyway I'm curious how long it could usually take.

Update 1: more than 40 minutes has passed, I see a new post with a video appeared on the remote side, and almost instantly here on lemmy.ml. But the previous post still not here.