Mine will react to adjustments within a couple of minutes.
Once the temps come up to ( 270-280 ) and after the meat is on and the fat starts dripping In the fire and I shut my two intakes down to 1/4 and the weber lid daisy wheel is full open the UDS will find the temperature that it wants to run at for an extend amount of time.
Mine likes 265-275. It will ride between those temps for hours.
I have issues when I try to force lower temps, say in the 220 range.