I've done 20+ implementations over the last 6 years for small (8 person non-profit) to large ($2B revenue, 5000+ users) organizations. I still find it hard to

I've done 20+ implementations over the last 6 years for small (8 person non-profit) to large ($2B revenue, 5000+ users) organizations. I still find it hard to estimate implementation times, and I think most people greatly underestimate the time and resources required. In your hypothetical sales organization with 10 users, I would estimate 2-4 months depending on how completely you want to migrate your business to the platform. You need time to work with leadership to outline broad strategic goals for the new CRM and to sit with end users to actually translate their existing processes onto the platform. This might take 1 or 2 consultants working 20-30 hours/week. I understand my bias here, but I cannot recommend finding an implementation partner (consultant) enough. Half of my work is fixing terrible half-implementations done internally by the "tech guy" that no one wants to use.