[minor] Support long (day) block-time-out values

[jayunit100]

Problem Statement

MDrip Block Time out doesnt accept day values

Solution

Either support pflag, or just update the docs w/ a long time example (i.e. --block-timeout-duration=48h.

Details

invalid argument "1d" for "--block-time-out" flag: time: unknown unit "d"

For some installation flows (long running ones), a day should be ok.