Coinbase just added Bitcoin Cash. So that's one reason why it took longer. Plus you can't just test this 10 times & decide. It all depends on how busy the blockchains are. Bitcoin got much higher, because people that had lots of Bitcoin, cashed out when it was $18K & higher. That drove the transaction fees higher. Those whales really didn't care what the fee was, they wanted their big profits. If people would quit paying the high fees, it would lower.