Reference

Saying when

Time is told with endings, and the ending depends on the unit of time.

What it is for

Days, seasons and years take -l, and months take -s
- Koosolek toimub teisipäeval.
  The meeting is on Tuesday.
- Lähen juulis puhkusele.
  I am going on vacation in July.
"For how long" works differently again

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Kirurg tegi päeva jooksul kolm operatsiooni.

The surgeon performed three operations during the day.

Film kestis kaks tundi.

The movie lasted two hours.

From and until each have their own ending

Watch out

There are no prepositions to lean on, so an English time phrase gives no hint which ending to use. You learn them one unit of time at a time.

4 units

Days, hours and when things happenA1Tell the time, name the days of the week, and say when something happens.
When, and how oftenA1Say when something happens and how often, from today to hardly ever.
Months and the days that matterA1Name the months, give a date, and say when your birthday is.
Plans and the futureA2Make arrangements, talk about your plans and say what you're going to do.