How soon after the end of a waveform can the next trigger take place?
A single Arbitrary Waveform is triggered by the External Trigger. You must wait one data point after your waveform concludes. To help you determine when the last data point of your waveform occurs, use the SYNC OUT, which has its own set of Arbitrary data points, as an indicator of the last data bit. That shortest pause is equivalent to your sample period.