It might not just be lemmy.world, but several times recently I've made posts (usually to !helldivers2.lemmy.ca) that I check throughout the day. Then like 8 hours after I've made the post, I'll see comments appear from people on lemmy.world that are several hours old.
It seems like there can be a queue that gets build up and then is suddenly flushed.
I see it happening the other way as well. This morning I made a post from my sh.itjust.works account and then switched over to a lemmy.world account and can't see it. So the delay is going both ways.
I'd like to celebrate early and possibly jinx myself in the process but the line is going down.
Lol the way that's dropping I'd say a celebration is in order!