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Testing is important for any company, but I do agree that the larger companies take longer and for good reason.
I usually test for about 1 month and jump on. I figured that someone has to actually use it or it will never get the first build upgraded. 🙂
As long as I can prove that no MAJOR issues exist, I jump to the new version very quickly. The other factor is any new changes to the GUI that require training. This will delay the install because I must first teach my users what has changed. In WF5 the Drawing GUI is completely different and will require some level of training on my part.
Not sure how long it will take me to move over to WF5, but I will keep you guys posted.