Realtor Commission on Short Term Rental San Antonio, Tx

[Fernando Tello]

I started renting my San Antonio, Tx property for "short-term" or "holiday" rental (3+ until 20 weeks max) a year.

The question I currently have is:
A local realtor just brought me the first clients through his network and the potential client wants to rent out 3 weeks in the coming thanksgiving holiday.

My question is how to calculate the realtor commission?

Common sense would dictate that hypothetically if he helped me rent the house for a whole year, then the norm is a whole month of rent. (Or in other words 4 weeks out of 54 weeks of the whole year of payment.) Should I use the same ratio to calculate it? Or is there a normal fee or percentages on short term rentals? 


Thanks for all the help in advance.