What is the appropriate word for these? -> one day, one month, one year and so on

I want to know the most appropriate word for these.

• one day


• two days


• three days


• one month


• two months


• three months


• one year


• two years


• three years

The context where these appears is that they are options users of a website can select from a menu to check the data of their weight for the certain range of time.

What's came up in my head is the following.

• period


• date range


• duration

Is there right one in the above list?