Welcome to the forum @PieterMarion1962
Each listing will say how long the pets can be left alone for . This can range from “never” to 6+ hours .
There are some sits with dogs where the dog can come with you when you go out for the day . Again you will find this information in the listing .
Before applying you should read the listings carefully and apply only to sits that you feel give you the free time that you are happy with as a mutual exchange .
This has been discussed on some other threads like this one