Direct answer
How long does ERP implementation take?
Custom ERP for mid-market manufacturers typically takes 12–20 weeks for core modules (inventory, production, finance sync). Enterprise suite rollouts often run 9–18 months. Phased go-live — one plant or module at a time — reduces risk and can put ROI on the board in quarter one.
Maxwell Electrodeal1 March 2026
Business context
Timeline extends with unclear scope, missing executive sponsor, or parallel legacy processes. Weekly demos and milestone billing keep delivery accountable.
Examples
- 14-week manufacturing ERP: discovery (2w) → core modules (8w) → UAT + go-live (4w).
- Phased chemical ERP: batch traceability first, then MSDS and advanced scheduling.
Comparison
| Phase | Duration | Output |
|---|---|---|
| Discovery | 2–4 weeks | Process maps, integration spec, roadmap |
| Build | 6–12 weeks | Core modules, Tally sync, mobile |
| UAT & go-live | 2–4 weeks | Training, hypercare, production cutover |
Benefits
- ✓ Phased value delivery
- ✓ Earlier ROI on priority modules
- ✓ Lower big-bang risk
Limitations
- ! Parallel run periods add calendar time
- ! Data migration quality affects go-live confidence
FAQ
- Can ERP go live faster than 12 weeks?
- Possible for narrow scope (e.g., inventory + dispatch only) with clean master data. Adding production, QC, and multi-plant logic realistically needs 12+ weeks.
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