Agree with the previous posts. Generally, from what I've read, recovery is considered 60-65% of max HR or less. When I go for a recovery day, I'll try to stay at 60%. If it's lower, that's fine also. Idea is just to spend some time spinning easily to get blood flowing without putting any load on the muscles or cardio system.
To climb the 200 ft hill coming back to my house, I have to slow to about 3 mph in 30/25 low to keep the HR below 65%.