Petsitters will generally stay as long as you ask, they usually have a minimum of a 20 minute stay and charge accordingly for longer periods of time, they dont necessarily have to stay over night.
Many except the busiest sitters will work around what you want and will tailor a service that suits you. I'm happy to leave my two for a couple of days with someone popping in twice per day to let them out for an hour but they have each other for company, if they didn't I might ask for 3x hour long visits a day or 2x longer ones. Theres only two people I trust to do it really, both of whom I know. A pet sitter with bird experience would be used in the event my two friends were both unavailable I wouldn't particuarly be happy about it but put it this way, it is not in the pet sitters interest to do stuff you dont want doing or accidently kill your pets because word of mouth and a good reputation is essential for their business and it takes a long time to get a decent client list to make a living off of. As long as you pick someone yourself, interview them, listen to your gut instinct, check out the references etc you will get a sitter with a good reputation. IMO its better to find someone you trust now, that way should you be rushed into hospital or something you know what options are available.





