See Duration.
I walked for/#in 20 minutes. Duration#001
I walked toGoal the store in/within/#for 20 minutes. [see Interval#005] Duration#002
I walked a mile in/within/#for 20 minutes. Duration#003
I mowed the lawn for/in/within an hour. Duration#004
I walked for the entire race. [the entire time of the race] Duration#005
I walked throughout/through/well into the night. Duration#006
The deal was negotiated over (the course of) a year. Duration#007
John went to the store for an hour. [he spent an hour at the store, not an hour going there] Duration#009
John left the party for an hour. [he spent an hour away from the party before returning] Duration#010
I lifted weights for an hour. [many individual lifting acts collectively lasting an hour] Duration#011
I walked to the store for a year. [over the course of a year, habitually went to the store by walking] Duration#012
I reached the summit in 3 days. [it took not more than 3 days] Interval#012
I had climbed 1000 feet in [a total of] 3 days. Interval#013
I fixed the engine in 3 days. [it took not more than 3 days] Interval#014
I haven’t eaten in/for hours. [hours have passed since the last time I ate] (#When haven’t you eaten?) Interval#015
The deal was negotiated over (the course of) a year. (Duration) Time#016