How long are the classes and how physical are they? Classes generally range from 30-60 minutes - walks and hikes tend to be a little longer. We strongly recommend that you text "SERVICE" to (831) 498-1944 to receive updates on class schedules and locations. Most classes cater to all levels of physical fitness and you are encouraged to participate only to the comforts of your limits and capabilities - you can leave a class at any time. Please note that all nature hikes do require maneuvering up and down hilly terrain at steep levels at certain points along the trials. How long are the classes and how physical are they?