Currently the limit is done in minutes, you can set this up to 3600 (2.5 days).
In theory the add-on could have any time limit and could be used in the way you have specified but the add-on doesn't work on a per thread basis so the 'no bump for 2 years rule' would apply to the whole forum when used.
That's a bummer.... This was SO useful for our classified ads section. Andy B has something similar.. "Bump Limit." I guess it'll have to do, or maybe he can be convinced to add the additional functionality.