I don’t blame you for questioning the reply, BlairJames. It’s important to have enough alerts to answer the phone.
Sr. Leader Weth is correct about there only being a thirty-second ring time.
One alternative to consider is updating the ringtone to a shorter ringtone than the one in place currently. This shorter ringtone time span will increase the number of rings within the thirty-second time frame. If you need any assistance with how to change the ringtone, then Apple has a great resource at the link below: