most investor with extra properties in other states or countries have a property manager check on it on a weekly or monthly basis for a fee. some people have a neighbor of the house check it with the neighbor being given permission to use it if guests need to stay there or other benefits just for going to check on it.
regarding if it can just be left sitting with no one renting it or checking it. it really is not an option as there can be many surprise unexpected maintenance issues that come up unexpectedly & if not fixed right away can cause major flooding or other issues that can ruin the house C”V. same like a car that just sits in your driveway the entire year. if its not used at least once a week just for a few minutes it can stop functioning for just sitting & building up residue & going through storms with just sitting there