every few hours or days, etc

At intervals of a few hours, days, etc

few and far between

Very rare

have had a few (facetious)

To have consumed a large number of alcoholic drinks, be drunk

in few (formal)

In a few words, briefly

no fewer than

As many as (a stated number)

not a few

A good number (of)

some few

An inconsiderable number

the few

The minority