Sort out meeting times without asking the PA (much).

Here are my invoices, do the paperwork and put them in please.

X is on the phone & wants to talk, I'm busy, deal with him please. (X's issue may be real but X may waste a lot of time getting to the point).

I have to travel, I'm going to Y, sort out some travel & accommodation.

That kind of thing, the time-sucking crap. (not speaking for myself but from observations of an old boss of mine).