There is no strict deadline for submitting peer feedback. However, we recommend completing it as soon as possible as the person who requested your feedback would appreciate your prompt response.
If the person requests your feedback on a regular basis, the current link will be valid until the next one is sent to you. For example. if a person wants to get your feedback once a month, the current link will be active for a given month until the new link is sent to you in the next month.