Vacating tenants

[Cordell Pearce]

I gave a couple of tenants a 30 day notice as it wasn't working out (they were living in a property with me) They left after one day. I have a 45 day notice clause in my lease for tenants. Would they be responsible for rent up until the end of the 30 day notice, or can they vacate and not pay rent for those 30 days as I was the one who asked them to leave? They were on a month to month notice. Denver, CO. I assume they would be responsible, as I could not ask them to leave after 24 hours if they gave me 45 days vacancy notice...