I have often heard that 1/4th of an inch is the minimum length of the hairs in the peyos area. For example, that is mentioned in an answer to a previous question:
My question is, "Are there authorities who hold that shorter peyos (that is, hairs in the peyos area shorter than 1/4th of an inch) are still acceptable? What is the absolute shortest length according to the most lenient Orthodox opinion?"
The only more lenient opinion I know of is that of R' Shlomo Aviner, who holds that 5 millimeters is the minimum. That's barely shorter than 1/4th of an inch (which is just over 6 millimeters.) But I think I've seen several Orthodox Jews with peyos shorter than 1/4th, potentially as short as a #1 guard or even no guard at all, so I'm hoping there are more lenient opinions out there to justify this practice. Thanks in advance!