Screen time is any time spent looking at a phone, television or tablet. The guidance for the early years is consistent across health bodies: keep it limited, and where it happens, watch alongside the child and talk about what is on the screen. The concern is less the screen itself than what it displaces — the pouring, climbing, arguing and being-bored that the same hour would otherwise have held.
There are no screens in our classrooms. This is a statement about what the hours are for, not a judgement about your living room.