During the campaign creation, upon selecting a specific budget in the Cappings & Limits section, you will be able to toggle the Evenly Distributed option:
This will allow your campaign to spread the specified daily or hourly budgets throughout that corresponding period.
So, in case you want to limit the spend, but still cover the whole period, it is an option for you.
💡The option will also honor the time-ranges you've set up in the campaigns.
Note: The setting will also respect the time you are starting the campaign and will start distributing the budget across the remainder of the time.