For FBA shipments sent to Amazons FCs how long do you find it takes your inventory to go from Delivered to Checked-In? I find mine taking longer than expected?

For FBA shipments sent to Amazons FCs how long do you find it takes your inventory to go from Delivered to Checked-In?

I find mine taking longer than expected

Can’t create a poll post but do you find it takes 1-2 days? 2-7? 10+?

Also is there anyway to optimize this process for amazon to do it faster?