Currently I have database with 80GB data running on Microsoft Dynamics NAV 2009R2 and planned to perform data conversion to Business central v21.
What is total time duration for perform data migration with path: NAV 2009R2 -> NAV 2015 -> BC v14 -> BC v21 if I following upgrade steps in url below.
https://cloudblogs.microsoft.com/dynamics365/no-audience/2015/02/23/upgrading-from-microsoft-dynamics-nav-2009-r2-or-microsoft-dynamics-nav-2009-sp1-to-microsoft-dynamics-nav-2015/
https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/upgrade/upgrade-paths
https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/upgrade/upgrade-technical-upgrade-v21