First off, the guild quests are awesome fun and help integrate me more into the game. Gives me a sense of purpose beyond my own selfish playtime and I get to learn the expansive world a bit better.
However, they seem to be started at random and sometimes inconveniently.
The powers to be may want to discuss scheduling these on a more consistent basis and publish a schedule. They will help ensure players are not in the middle of something, make sure their inventory has room, or that they have a fresh set of tools (pro tip: tools wear down so take 2 or 3 along with you on guild quests).
I believe there are currently five quests per cycle (not sure that changes as we grow larger). Knowing when they are scheduled would help me be better prepared to help out.
Just a thought.