About 10 minutes. If payment doesn't complete, the pitch is released.
When you go through to payment, your pitch is reserved for about 10 minutes. That stops someone else booking it while you type in your card details.
If payment doesn't complete in time, the reservation expires and the pitch becomes available again. Nothing is charged, and you can simply start the booking again.
Email support@pillowcase.io with your campsite name or booking reference and we'll pick it up from there.