Has anyone heard how long this game will last generally? Don't want to preorder and anticipate a great game coming to find out it"s only 6 hours long. And has anyone heard about online play for this? Thanks for your time

Don't know about the length, but it will have an amazing replay value, with different possible playstyles, different ways to reach objectives, character customization (it won't be possible to get all upgrades during one playthrough) etc.

I'm hoping for 30-50 hours

It will last longer than chewing gum. But ten to twelve missions I'm guessing.

I believe it will be above 10 hours even with the guns blazing approach. No official information as of yet.