~2 months

Don't know much else about your situation but I would ask who that slide deck was intended for. It's possible that it was only meant for sales/client facing people. In my experience bonuses tend to be a lot more common on that side of the house. If not, you could always walk and just leave it off your resume, but it's obviously a hard decision

Sign on bonuses are very common in software engineering and other hard-to-hire roles in tech right now.