Personally, I use a 6 day cycle. The first days over harvest, the next days farm enough to cope with the demand and the last days empty the storage.
For my six days setup I use 1 launch pad, 1 extractor and 3 basic processors. For 2 weeks you probably need a storage silo as the launch pad won’t be enough.
I also only rarely change the actual extractor spot and only slightly move the harvester heads around because they heads have a huge range depending on the planet radius.