I can easily spend 10 hours or more in game per week, that is not the problem. But sadly I can't block 3/4 hours as a recurring event on the same days every week...
I work freelance and my deadlines organise my game time.

So the question rather focusses on this:
What if you really can't make a static work, unless it's a group of people (8+) that does content as soon as all roles are filled.
I guess this only exists as part of an endgame linkshell... But I've only found these full of randoms, without social aspects or attachments.