The inNO-T software can be used to record and save data for a month or more.  However, the default setting for recording memory is 100K which is only enough memory for up to 13 hours of recording at a sampling rate of 2/sec.  To increase the recording time, go to "setup" then "recording memory" then choose 2 or 5 megabyte.  For maximum recording time decrease the sampling rate to 1/sec at 5 megabyte recording memory.