Wiktionary
biochron
n. the length of time represented by a biozone
Wikipedia
Biochron
A biochron (from the Greek bios, life; and khronos, time) is the length of time represented by a biostratigraphic zone. Biochrons are named after characteristic fossil organisms or taxa that characterise that interval in time.
Usage examples of "biochron".
I'd estimate that you have actually lived about three years of personal time, biochron time, since then.