Yes, there is a period of time your data is available before it expires.
Report links will expire after 7 days. However, the report data remains in Vista for 30 days. These are Amazon-imposed limits which we are beholden to. If you miss your window to download in the 7 day period but are within the 30 day period, Near Support may be able to regenerate the download links for you. If the data reports have expired (over 30 days old), the report will need to be re-run.
Please contact Vista Support for assistance.