@r.sander here is my setting:
Notification period
np1: 6:00-9:00
np2: 13:00-17:00
Maximum number of check attempts 0
Enable/disable notifications for hosts 0
Enable/disable notifications for services 0
Delay service notifications for service 0
Delay: days: 0 hours: 0 mins: 35 secs:0
Normal check interval for service checks
days: 0 hours: 5 mins:0 secs:0