Each case is based on its own individual merits. As such, it is impossible to know firstly whether it will be successful and secondly, how long the Judge might reduce the period of disqualification for.
For some people nearing the end of the disqualification period, it might simply be best to “wait it out” rather than make an application.
Another word of warning is that even if a court does reduce the period of disqualification, it might only do so for a short period – eg 6 months or a year. Whilst this is better than serving the entire period of the original disqualification, a person always needs to assess the cost / benefit of such a reduction.