Tracking assistant hours

[Phil C.]

Greeting!

I am self-managing my properties with some help from my handy friends. As the number of doors is growing, I plan to hire a local assistant to help me with tasks like answering emails and text messages, scheduling and conducting showings, background check, coordinating the hours for pest control, etc. 

It is a part time job with ad hoc hours. I try to find a good way to track the hours, so it will be fair and reasonable to pay for the job. However, some hour tracking tools are clock-in and clock-out which seem not a great fit as it does not fit for those ad hoc calls and messages. 

Is there any good way to handle this case? Or should it be more a salary role instead of a pay-by-hour role?

Thanks a lot and hope this question can help other people too!