I answered this question in here.
But to add some information: the RPi Compute Module is designed for industrial applications so expect it to be much more robust than the standard RPi. Regarding the eMMC memory, it is very difficult to find reliable information about the durability of a specific chip but it looks like eMMC uses MLC and SD cards TLC NAND flash. MLC flash supports from 3 to 5 times more P/E (program/erase) cycles than TLC flash. Be free to google more information
So i think the only way to find out is running specific stress tests.