Be able to set budget period

As a user, when setting the budget, I want to be able to specify whether this is a budget per day, per week, per period (then be able to select date from/to) or for the entire project.

You have projects on post-calculation that are on-going in nature, for example as a Product Owner you have 8 hours per week to spend on project management time, but it is an on-going process where the maximum number of hours is the budget and the project has no end date. But you want to be able to monitor the agreed budget each week.