@MikeH, thanks for the reply and this is all on me as I made a rookie mistake. I had injected a new line of code (G4 P10000) to allow my spindle to get up to speed prior to making the first move, and I forgot that the Buildbotics controller has units of seconds, and not milliseconds, on the dwell time parameter. Therefore, the behavior I observed was because I thought the spindle would dwell for 10 seconds, but it was actually trying to pause for 10,000 seconds (i.e., almost 3 hours) 
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