Another story for that same project: this was a program where being two weeks behind schedule resulted in theatrics. Think English Parliament in period pieces, but toned down and with more ties.
That same other lead and I had figured out that IBM was perpetually 5 weeks behind, and always fishing for problems on other teams they could use to invoke day-for-day schedule slippage.
And the reason we knew it was five weeks is this: they would not take patches or hot fixes from us. Because doing so would indicate that we hadn’t fulfilled out contract to deliver on X date. So I’d give them version 1.0.4 (had to be exactly 1.0.4, if the CI/CD pipeline glitched and I gave them 1.0.5 they would demand an explanation, fuckers). And then I’d go off working on catching up with automating functional testing that we were still figuring out, trying to get it to run faster on one particular underpowered destination system, or get feedback from other teams about how some feature in the release was fundamentally broken, and I’d fix those problems and issue 1.0.5-7.
I’d tell them they needed the patch and they would say no. Then eight weeks after we gave it to them they’d complain it was broken, they are blocked, and the schedule will slip “day for day” until we fix the bugs - often bugs they should have seen week one if they were actually using the deliverables we gave them.
In one case it took me about 14 clock hours to fix their problem, but in all other cases I had already fixed that bug almost exactly six weeks before they found it. I just informed them that 1.0.7 already fixes that, upgrade. They were hoping for a week and every time they got less than a day, and only then if the meeting schedule aligned so the could stall for half a day. That was honestly one of the more satisfying aspects of that job.
Ten times they came at us with that schtick, and it worked once. Barely.
Near as I can tell they were spending a month at the beginning of each milestone cleaning up tech debt from stapling together the feature set for the previous milestone, and not getting around to our stuff until much later than they wanted the company to know.