How to capture intervals (as lists) of a continuis signal with no uper limit using python?

I have a time versus acceleration signal and what I actually want to achieve is that, I have an incoming acceleration (with no upper time limit) signal (Green Bars) and I want to check if these incoming samples are in the range 0-20 ms, 10-30 ms or 20-40 ms and so on. If they are in such an interval then I have to approximate points (black dots) using this data. for example, if current values are in between 0-20 ms then I can use all of these values to approximate value at 10 ms by some approximation (let's suppose there is no current value at 10 ms). Approximation method is not important right now, I just want to capture these values

Thanks for your time :)