Im not finishing my thought completely cause I don’t know how much people want to read what my thumbs convey. Despite it taking longer to do, the more time spent is what appears to be the longer proof of work amount of time spent. There is also time spent on mining, to ackquire the copy of the blockchain that everyone is using. To validate transactions across it, using raw logic, from the very most painful parts of the brain to go down. The rabbit hole, as @darthcoin has alluded, goes as deep as you want it. The concept is as simple as keep your keys safe. That’s a lot of work and time to do when you have multiple safes, but if you don’t have money for safes, that kind of security risk can weigh on the brain.