Survival periods balance business practicality with the shelf life of the information. Two to five years after termination is common for commercial data, pricing, and technical details that eventually become stale. Trade secrets—information that derives value from secrecy and is protected with reasonable measures—are typically carved out to survive as long as they remain trade secrets under law.
If the relationship involves highly sensitive data (source code, security architecture, acquisition plans), longer survival may be warranted. Conversely, for fast-moving products or marketing content, shorter survival can be acceptable.
Whatever period you choose, make sure it matches how long the information will remain commercially valuable and that both teams have processes to track when obligations end.
THIS IS NOT LEGAL ADVICE.