I was wondering if it is OK to take a "breather" occasionally, between one breath cycle of SBP and the next, or must the cycles be continuous. Any comment welcome.
Go with what feels natural. If a break feels like what is happeneing, go with a break.
http://www.aypsite.org/62.html With the above points for basic understanding, we can say that a spinal breathing cycle (including both inhalation and exhalation) can vary from fifteen seconds to half a minute. It can be shorter or longer than this range. Don't set goals. Let your body tell you what is right. Sometimes we may need more air. Other times our breath may suspend completely during pranayama. It is a natural process. We just go with it and follow the procedure. Likewise, we may notice changing patterns of breath in meditation, where there is no direct supervision of breath at all -- just using the mantra. The body will purify itself when given the opportunity. Changes in breath are an indicator that something good is happening. Advanced yoga practices are working for us. We just stay with the program.