Thufagoonn17 Platform 33 is located underground, just below the “ground floor” platforms 3 to 18 of the Zurich HB station (see plan).
So 8 minutes would be even enough time for walking (or use the escalators) back and forth between 33 and 8 about 3 to 4 times, depending on your fitness 😊
On a more serious note: The length of the platform (or, more precisely, the length of your train(s) and where you sit within) has a much bigger impact on the transfer time than +/- 2 tracks, once you’re in the respective connecting underpass or footbridge. Just Zurich HB may sound a bit scary if you don’t know that the 2-digit track numbers starting with 2., 3. or 4. are all located just underneath the tracks 3 - 18.