The only place I have heard of this (floating every 4 hrs) is at Kaiser. However, I know of hospitals in Az that SPECIFICALLY hire ICU nurses and then float them where ever(but it's for the full 12 shift) My friend worked at such an assignment and said she spent about oneday a month actually in ICU unit. When I interview, I ask about float policies, tell them I will float PCU/Tele and then write that into my contract.