My Home made cider is clearing out by its self?

well i am using cider yeast and it has been 4 days and now my cider is starting to clear up and look more like cider i thought for this to happen you had to leave for like a month it is still fermenting as we speak but how come its clearing so fast i am using inmate brew method but a bit more hygienic and a little more effort i am not sure if its the yeast i am using that makes it clear so fast (Young's cider yeast) i am not complaining just curious as to why after 4 days it already clearing up