Libby, are you referring to this paragraph?
Systematic short-time working
This situation arises if you are normally working full-time but short-time working is introduced on a temporary basis. You will continue to pay PRSI in the normal way. If the short-time work involves a three-day week, you may get Jobseeker's Benefit for the other two days, provided you meet the other relevant conditions that apply to Jobseeker's Benefit. In this situation, the social welfare week is five days and you will get two-fifths of the normal amount of Jobseeker's Benefit. There are no limits on how long short-time working can continue. There are circumstances however in which you may be able to claim a redundancy payment, which would mean that you would be wholly unemployed.
This would most likely apply in your case, as you are having your normal working week reduced. In this case, the weekly payment is divided by 5 instead of 6, meaning you would get a higher daily rate than someone who is fully unemployed, but would be paid only for the days you are not working. The 6-day week applies to someone who is totally unemployed, or, in some cases, begins a part-time job.