When company bills the customer for time sheets it can happen periodically based on week or month or Daily as well. It is common practice to do Monthly billing of time sheets though. In Odoo we can have all these options under this navigation Settings>> General settings >> Human resource
You can customize to get the mail notification sent to project manager and leads so they can validate and put the time sheet for billing.
Please Contact us if you have any Odoo Implementation requirements to Hire dedicated Odoo developers or Odoo Development services from KTree. KTree is Best offshore Odoo development company with extensive experience in building Odoo ERP Modules & Integration.Request For Quote