Key assist for a guest lock that does not work – no more than 5 minutes
Room service – 30 minutes
Rollaway or Crib – unless guest says it is needed right away, 30 minutes or even more.
Additional pillows or towels – unless guest says it is needed right away, 30 minutes or even more.
The last 2 I never have had to ask for, so my opinion should be taken with grain of salt.