Update description of setting "tl3 time period"

The current description reads:

Trust Level 3 requirements time period (in days)

I shared that this description is confusing as it isn’t quite descript to the uninitiated:

I would propose something to the effect of:

Time period (in days) in which all Trust Level 3 requirements are determined against.

I would even go as far as to say that the name could be more descript. While longer, something pragmatic like tl3 requirements time period would be great too.