100-Day ERP Go-Live Is Marketing. Real Implementation Takes Honest Timelines.
Fixed-scope ERP implementations sell well but fail users. I've spent years cleaning up the mess.
I've seen the 100-day ERP promise. It's real for maybe 5% of companies. The rest? They're walking into a trap.
Here's what happens: You get a shiny new system on day 100. Your team has been through intensive training. Consultants declare victory and leave. By month four, you're running parallel systems because the workflows don't match reality. By month eight, you've paid three times the original budget for "custom modules" that should've been in scope.
I've done enough ERPNext and Odoo migrations to know the difference between "live" and "working."
The problem isn't the methodology. It's the sales model. Fixed scope means the vendor wins when they finish, not when your team succeeds. I've inherited systems where everything technically works but nobody uses them because the configuration was optimized for the implementation timeline, not for actual business processes.
My approach flips this. I work with companies on their actual timeline. Sometimes that's three months. Sometimes it's nine. I build what they need, not what fits the contract.
For open source ERPNext and Odoo, this matters even more. You own the code. You're not locked into a vendor's refresh cycle. But that means the implementation quality directly affects your operational cost for the next five years.
A few things I always do:
Start with process mapping. Not the idealized version. The real one. Watch people work for a week before you touch any configuration.
Phase the rollout. Get one department fully live and stable before moving to the next. Sounds slower. It's actually faster because you catch problems early.
Leave room for iteration. I always allocate 20% of the timeline for "we didn't think about this." Because you won't until users touch the system.
Build for your team, not the consultant. Every configuration should be maintainable by someone on your staff in two years when I'm gone.
Yes, this takes longer. But you actually adopt the system. That's the only metric that matters.