As requested, here's the 300 hour guide translated:
The 300 hour guide is actually derived from the 90 hours guide, so I presented here first:
CLANNAD 90 hours walkthrough
90 hours is the official time for finishing the main routes, completing 100% and BGM. But experienced players might be able to do it faster.
Detailed walkthrough of each routes and After Story:
To be continued...
Contents to be added:
Walkthrough for baseball route
Walkthrough for war game route
Walkthrough for bad end
Walkthrough for mysterious man
I ended up making a new version...Uguu...