Procurement timelines are almost always underestimated in the same direction. The technical work — writing specs, running tenders, evaluating bids — takes roughly as long as people expect. The organizational work — getting alignment on what you actually want before the process starts — takes two to three times longer.
The result is that the timeline slips not because the procurement ran badly, but because it started before the internal work was finished. This is fixable. It just requires treating stakeholder alignment as part of the procurement process rather than a prerequisite to it.