heyday, prime, height

irregular, occasional, unscheduled

irregularity

favorable progress / meeting a deadline, being on time

to make favorable progress, to proceed as expected / to meet a deadline, to be on time

meeting a deadline, being on time / favorable progress

to make favorable progress, to proceed as expected / to meet a deadline, to be on time

(rare) favorable progress / (rare) meeting a deadline, being on time

(rare) to make favorable progress, to proceed as expected / (rare) to meet a deadline, to be on time

puberty