5 years of security updates, 3 years of feature updates.
On the page it says on the 12th footnote, "Feature drops for at least 3 years from when the device first became available on the Google Store in the US. Your Pixel will receive feature drops during the applicable Android update and support periods for the phone. See g.co/pixel/updates for details."
On https://support.google.com/pixelphone/answer/4457705 it says, "Guaranteed Android version updates until at least: October 2024" and "Guaranteed security updates until at least: October 2026" for Pixel 6 and Pixel 6 Pro
So they hypothetically could extend it to more than 3 years of feature updates and 5 years of security updates with the nebulous "at least" wording.
On the page it says on the 12th footnote, "Feature drops for at least 3 years from when the device first became available on the Google Store in the US. Your Pixel will receive feature drops during the applicable Android update and support periods for the phone. See g.co/pixel/updates for details."
On https://support.google.com/pixelphone/answer/4457705 it says, "Guaranteed Android version updates until at least: October 2024" and "Guaranteed security updates until at least: October 2026" for Pixel 6 and Pixel 6 Pro
So they hypothetically could extend it to more than 3 years of feature updates and 5 years of security updates with the nebulous "at least" wording.