The stretch nobody examines
Sales process work concentrates on the parts that feel effortful: generating enquiries, qualifying, running the meeting. The stretch between sending a proposal and getting an answer looks like waiting, so it gets treated as weather rather than as a process. In most small businesses it is the longest interval in the cycle and the one with the most recoverable time in it.
The first useful realisation is usually that a substantial part of the delay belongs to the seller. Producing the document took days, the first follow-up came a week later, the revision took several more days. None of that is buyer behaviour, and all of it is changeable.