TPRS year 4 - Preferred Activity Time (PAT)

This year I have decided to implement PAT.  I have trained my classes fairly well the last two years.  But something that happens in my new school is a pox on my life: block scheduling.

While 90 minutes could thoeretically have wonderful implications for a Comprehensible Input classroom (more time to practice a story; more time to do extensions after story on the same day), it can be a beast for transitions.