We can add more details to talk about time by using prepositions. Here are some examples:
Days or dates: on
I go to the gym on Mondays.
Sally studies English on Fridays.
Ed will visit his grandparents on the weekend.
She will visit the doctor on June 15.
Start and finish points: from/to or between/and
I work from 9pm to 5pm.
I work between 9pm and 5pm.
The bugs come out between dawn and dusk.
The ski resort is open between September and May.
Only a finish point: until
I work until 5pm.
I cannot leave until the teacher comes back.
I will keep eating until I am full.
To talk about how long: for
I have been working for 7 hours.
I have been waiting for an hour to see the doctor.
We lined up for 3 hours to buy tickets for the concert.
To talk about what you did in between,
use during.
I went for a walk during my break.
During summer vacation I went swimming a lot.
I slept well during the flight.
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