How long does an Odoo implementation take for an SME?

Typically 6–16 weeks from kick-off to go-live: services companies 4–8 weeks, wholesale and trading 6–12, manufacturing 10–16 or more. The duration is set mostly by data quality and key-user availability, not by module count.

Can Odoo go live in one month?

Yes, with standard processes adopted as-is, one legal entity, clean data and an involved decision-maker. CRM plus invoicing in 2–4 weeks is routine; a complete ERP in 4 weeks demands near-full-time client involvement.

What delays Odoo projects most often?

Organisational issues: key users without allocated time, underestimated data cleaning, mid-project scope additions and badly timed accounting cutovers. Technology is rarely the bottleneck.

Is a big-bang go-live or phased rollout better?

Below roughly 50 users a big-bang cutover usually wins – one weekend, no double entry. Phased rollouts suit manufacturing and multi-entity groups. Full parallel running should not exceed one accounting month.

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GUIDE · UPDATED JULY 2026

How long does an Odoo implementation take?

By the Impromatrix consulting team – Odoo since 2020, ERP since 2011

For a typical SME: 6–16 weeks from kick-off to go-live. Services companies land near the bottom of that range, manufacturers near the top. Here is the phase-by-phase breakdown – and what a one-month go-live actually requires.

Phase by phase (typical SME, 10–50 users)

Phase

What happens

Duration

Scoping & audit

Processes mapped, module list fixed, success criteria and cutover date agreed.

1–2 weeks

Configuration

Standard modules set up on a test database, iterated weekly with your key users.

2–6 weeks

Data migration

Master data cleaned and imported; opening balances land last.

1–3 weeks, parallel

Custom development

Only what scoping proved necessary – ideally very little.

0–6 weeks, parallel

Testing & training

Key users run real scenarios end-to-end; fixes; then training everyone else.

2–3 weeks

Go-live

Cutover on a weekend; hypercare support while the dust settles.

1 weekend + 2–4 weeks

By company profile

Profile

Total duration

Usual long pole

Services company, 5–15 users

4–8 weeks

CRM habits, timesheet discipline

Wholesale / trading, 10–40 users

6–12 weeks

Stock data quality, barcode processes

Manufacturing, 20–80 users

10–16+ weeks

BoMs, routings, costing method decisions

These assume a decision-maker who answers within a day and key users with real weekly hours for the project. Doubling every estimate is not pessimism if neither is true.

Can we go live in a month?

Yes, under strict conditions: standard processes you are willing to adopt as-is, one legal entity, clean data, and a decision-maker inside the project. CRM plus invoicing in 2–4 weeks is routine; a full trading-company ERP in 4 weeks only works with near-full-time client involvement.

What actually causes overruns?

Rarely the technology. The classics: key users with no time allocated, data cleaning discovered too late, scope additions mid-project ("while we’re at it…"), and accounting cutover pushed across a fiscal-year boundary. A fixed scope and a named decision-maker prevent most of it.

Big bang or phased rollout?

Under ~50 users, big bang usually wins: one cutover, no months of double entry. Phased per module makes sense for manufacturing (logistics first, MRP second) or multiple entities. Running old and new systems fully in parallel doubles everyone’s workload – avoid it beyond one accounting month.

When should we start to hit a specific date?

Count backwards: go-live needs a quiet period, not your season peak. A fiscal-year start makes accounting cleanest, but January slots fill up first – a mid-year cutover with imported opening balances works just as well and books far easier.

KEEP READING

What an Odoo implementation costs (2026) → Partner vs freelancer vs in-house → Odoo 16→18 migration: what breaks, what it costs →

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