Estimating size of large data download


I am planning to download a large amount of waveform data using the MassDownloader. I’m wondering if anyone can offer tips for estimating the size of the download before launching it? In other words, I would like to know the number of TB of storage my download will require. I am new to ObsPy and working with waveform data, so any tips or best practices are much appreciated.

Thanks in advance,

I don’t think there is an easy way to get an estimate without some test runs. The major unknown I think is: how many stations will data be downloaded for?
All I can think of is to first run it with only a few select timespans and then extrapolate from there to your full envisioned data set.