We all have busy schedules and sometimes we just miss a walk request. But don't worry just try to either accept or deny a walk request next time :)
On-Demand Walk Requests: You have 3 minutes to accept on-demand walk requests from clients.
Scheduled (future) Walk Requests: You have 15 minutes to accept scheduled walk requests from clients.
What happens if the walk request times out? Don't worry you won't leave a client hanging! The app will send that walk request to a few other Walkers in your area.