What to expect from OS3 update

[DLite]

I am getting upgraded from 2.10.3 to 3.1.1, and I have to pick a convenient day for this to occur.  About how long should I expect my C4 system to be offline for this upgrade?  My dealer has already gone through the process of replacing drivers that are obsolete in OS3, so I am assuming/hoping there won't be any additional time for that. 

My dealer characterizes my project as being on the larger side, although I'm not sure how best to quantify that here.  When Composer launches, it shows that it is loading 625 drivers, if that helps.

Thanks

 

[sonic30101]

Usually under 2ish hours depending on the number of secondary controllers for the upgrade itself. Then at least an hour or 2 for testing and tutorial to get started. Followed by a rabbit hole to do customizations of favorite pages and wallpapers which is not necessarily a dealer thing if you like to tinker. The 625 number is the amount of drivers on the computer not in the project

[DLite]

Thanks a lot — very helpful!