22 day pass is for 22 consecutive days. A 15 days in 2 months or even a 10 day in 2 months is the closest to what you sound like you might want.
It all really depends on where you wish to go and how much traveling you intend to do, bear in mind the limitations of Eurail passes, especially them not being valid on most city metro type networks so they aren’t much use for days spent touring a city.
Eurail Pass is only really cost effective for days where you make a reasonably long journey. In many places single tickets or local day tickets will be better if you are making a shorter hop or touring a city or region.