Marquee farm length

I can't speak from personal experience because I don't keep track of stuff like that (it doesn't really change anything imo, you just need to farm until you're done), but from the maths:

You need 280 shards from 3* to 7*. The drop rate is 1/3 on average, which means you should expect to need 840 attempts at a node. At 5 sims a day that's 168 days; at the current 8 sims a day that's 105 days.

93 days, or 3 months.

Which is why lots of ppl do at least 1 refresh a day to cut it down to 53 days (based off Failing Crab's math)

Drop rate is approximately 1/3 over long term.

Thanks everyone for the info, this’ll help me know how much time I have for certain events to come. And another question, if anyone knows it, how long do heroes journeys take to come back?

First time CLS came back was 140 days or almost 5 months.