Anyway regardless this low fee hours, there are some poor managed exchanges or entities that looks they don't know what are they doing or how the fees works on the bitcoin mining process
There is some speculation that some exchanges use this medium to make some profits. They put a very high estimate on the exchange dashboard, but send the transaction with something much lower than that and pocket the rest of the fees paid
In many exchanges you cannot ascertain when they actually send the Bitcoin out and do not get any txid to monitor it on.
The miner actually don't care how much fee you pay they are going to mine at their same speed proof of that is that the
~19.82 Bitcoin fee stay almost 7 minutes on mempool before being mined:
Miners do care.
This happened probably because the next block to the confirmed took 7 minutes to be confirmed.
Bitcoin transactions are calculated in blocks and not time, so when you pay a higher feerate you are asking for it to be confirmed in the next block or next 2 blocks and not in the next minute.