How to parse rules like "every two hours" , "every two days" etc

Hi,I want to parse the rules like "every two hours" , "every two days", "every two weeks", "every two months" etc. I'm a newbie and don't know what to do . Please help me, thanks!

The issue does not name a file, rule, test, or entry point. Start by examining Duckling's composable language-rule system and existing duration or recurrence parsing behavior, then define the expected parses for intervals such as “every two hours” and add coverage showing those results.

Written by the indexing model from the issue text.