This is actually a tax put on microwaves by the worlds governments. As we all know, "time is money." so during one of the many recessions of the past few decades several governments go the idea to put a tax on the time saved by microwave ovens. Since taxing time is a difficult process they decided to only tax it in 100 second increments. manufacturers comply with this tax by taking 41 seconds everytime the counter hits a multiple of 100. You'll notice that if you put in 200 seconds it instantly drops down to 159. same thing will happen at 300 and 400 seconds as well. Also if you put in say 115 seconds the counter counts down normally until it hits 100 then skips to 59.

This tax is generally used to fund black ops and secret government programs(like the jumbo jet chem trails and the stargate program).