A real NetSuite implementation runs through a few predictable phases: discovery and requirements gathering, configuring the chart of accounts and whichever modules the business actually needs, migrating data out of the old system, a round of user testing, and go-live, usually followed by a short stabilization period where the implementation partner is still close by.
Most of this work happens through a certified NetSuite implementation partner, a separate category of provider from Oracle, who's done this configuration and data migration before and knows where it tends to go wrong. Some rollouts go through NetSuite's own SuiteSuccess methodology, which packages pre-built industry templates for a faster path to a narrower initial go-live, with more modules added in later phases.
Timeline and cost both vary a lot more than businesses expect going in. A straightforward mid-market rollout often runs three to six months; multiple subsidiaries, multiple currencies, or heavy customization stretch that out considerably. Cost isn't published anywhere because it depends entirely on scope, same as the license itself.