OSD Recovery time

Hi all. I want to have a measurement on how much time it takes for degraded pgs to be recovered when one OSD fails? I know it has many dependencies like network, disk, kernel, recovery config, ... and I want to have a formula or something else that I can find out if one of my OSDs fails, how much time does it take for the cluster to recover. Does anyone have any doc or idea how I can measure this with the dependencies it has or give me some points that I can have a better sense of this? Thanks all.