I understand you are looking to capture an acquisition of approximately 30 minutes (1800 seconds) using the TBS2102. Unfortunately, this scope only supports up to 100 seconds per division, so times 15 horizontal divisions this gives you up to 1500 seconds in an acquisition.
There might be other options depending on what you are doing. Do you need raw waveform data for 1800 seconds? Or can you data-log an automated measurement (Amplitude or Frequency, for example) say once per second for the 30 minutes duration?