If more than one escort is working from the same place they can help one another out. Groups used maids for this, and those without contacts can look into agencies.
I do not know who or how you think independent escorts are meant to find someone to do this work for them. Who will bother with 2 hours a week at minimum wage. Doesn't make sense discretion wise or from the employees point of view.
And what admin duties are you on about. Going through messages to sort what is worth a reply, actually replying. They'd have to know exactly how the escort worked, her full timetable, screening processes etc. A lot to ask for 2 hours at minimum pay. Agencies do it on mass and charge a percentage. An employee seeing how low their cut is compared to the gross will ask for more.
Phone calls and texts dont come in convenient two hour bursts, they happen whenever, when escorts are in bookings.
I told an escort notoriously bad with comms to get her useless layabout boyfriend to help out, get her organized. The situation was right for that, apart from phone answering. Most independents won't have such a convenient and trustworthy go to.