present perfect vs Present Perfect Continuous

[Lilish]

Hello there,
I wonder if we could use both Presnt Perfect &Present Perfect Continuous in the last line of this following paragraph

We have been sitting here over half an hour staring at him.He has been running from table to table taking orders and serving food,
and he has not been looking /has not looked at us.
what is the difference between Present Perfect&Present Perfect Continuous?

[Mister Micawber]

.
Continuous is wrong here; waiter's looks are not of duration, but are intermittent glances.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber