If you can take the call and do figure 8s as you talk … indefinitely.
If the interruption has very little impact on your chi… as long as an hour.
Sometimes when I get interrupted, I’ll opt for figure 8s in the time I have left.
I go into figure 8s without warm ups just about every day, in any circumstance.
The sequence we do in class creates a crescendo effect… it sets up the most complete workout. Honor it when possible. Opt for figure 8s anytime.
Hope that helps.
Enjoy your day.
D