In the documentation athttps://www.django-rest-framework.org/api-guide/throttling/ the allowed throttling periods are indicated assecond,minute,hour orday.

Further in the same page, an example shows, instead, the use of justmin.

Looking at the source code it is evident that just the first letter of the period is considered:

I think this should be clarified to the user, e.g. something like:

The throttling period is specified after the/ separator by usings,m,h ord. The use of an extended unit such assecond,minute,hour orday or evensec,min,hr is allowed too (only the first character is relevant).