Absolutely this! I think the question also needs to be is this so mission critical that they need 30 minute response time? If not a 4 or 8 or 24 hour response

Absolutely this! I think the question also needs to be is this so mission critical that they need 30 minute response time? If not a 4 or 8 or 24 hour response time during the week is a much more realistic way for you to cover them or leverage this to bring on the second person.