Thank you for your interest in Sump Pumps Direct. Unfortunately, we do not offer any vertical float switches with a longer on/off range. Another option however, might be the PHCC Pro Series Ultimate Sensor Digital Pump Controller System, model USC3 which gives you the ability to control your pump run time from 5-45 seconds of the HydroCheck Electronic Hi-Lo Pump Switch, model HC6000 which includes 2 sensors, one for your "On" point and one for your "Off" point. Please note that these switches are for use with any sump pump rated up to a maximum 12-14 running amps.
If you have additional questions, please let me know.