The time it takes to level up will be different (Not sure by how much due to the balancing of jobs that occurred in 2018) but you can estimate an average by using the values in this guide (Yes I know it is old but this is the best estimate you can get at the moment). http://era-go.com/forum/showthread.p...ng-Level-Guide
Calculate an average by: choosing a specific level between 44-99, adding a whole extra second to it to account for the potential time it takes to mine another rock, divide the total amount of rocks by 2/3 since you will end up losing about 1/3 of the rocks to nothing, multiply that result by 5 and that would be the average amount you would get.
But just know, this is safe estimate. You might get more or less depending on your luck.