ERP Strategy
How Long Does an ERP Migration Really Take?
From assessment through go-live: realistic timelines for Oracle, D365, and SAP migrations, plus the five factors that make the difference.
The Short Answer
Most ERP migrations take 12 to 24 months from kickoff to go-live. But that timeline sits on a wide range: we've seen greenfield D365 implementations land in 8 months and enterprise SAP transformations take 36. The difference isn't complexity or budget, it's how well the five timeline drivers align.
The Five Timeline Drivers
1. Scope (Extend / Adopt / Modernize)
Are you replatforming an existing system (Adopt: 12-18 months), or rearchitecting to cloud-native design (Modernize: 18-24 months)? Greenfield builds on a platform you know (Extend) compress to 8-12 months.
2. Data Quality & Readiness
Spend 6-8 weeks before kickoff auditing your source systems. Clean data accelerates UAT by 2-3 months. Dirty data can add 4-6 months to scrubbing, migration, and validation.
3. Change Readiness & Training
Underestimating people is the #1 reason migrations slip. Plan 6-8 weeks for training and change management. Organizations that make this a parallel workstream (not post-go-live) hit their dates.
4. Vendor Support & Methodology
Vendors with in-house delivery methodologies (Oracle's AIM, Microsoft's Sure Step) shorten by 4-8 weeks. Partners who build custom playbooks add time.
5. Stakeholder Availability
Key business users and IT leads need to be hands-on 30-40% of project time. Availability gaps slip schedules by weeks per month. Dedicated resource pools close projects faster.
Sample Timelines
The Bottom Line
Most delays aren't technical, they're organizational. Lock in resources, clean your data upfront, and invest in change management. Those three moves compress schedules by 6-10 weeks more reliably than any other lever.
Lock in resources, clean your data upfront and plan change management, and the schedule compresses by 6-10 weeks.
We can help you assess realistic schedules and resource plans.