Server version: spigot 1.11.2
plugin version: 4.0.3

Error: http://pastebin.com/xQcfU7mn
Settings: http://pastebin.com/06jugZgE
Paths: http://pastebin.com/v4Z99hhq

Regardless of what format of time I use, it refuses to see it as a valid form of requirement.

You cannot use 's' as a time unit, only 'm' (minutes), 'h' (hours) and 'd' (days) are allowed.