You Know You've Been Doing Too Much Hammer When...
Probably.
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"Pretty is better than ugly, but if it doesn't work, ugly is better than pretty"
-Phyton
I spent time remaining in an exam last year exactly working out how I would remake the exam hall in Hammer, props, lighting, textures and everything.
Shame I never went home and actually did it xD
You look at the time it's 6:00pm, then look again later it's 3:00am. You wonder to yourself, "Where did the time go?" Then you get of the office chair, finding a lage dent in it you think, "I can't have done this!". After that, you get to bed falling asleep like a ton of lead in quicksand. Then like he said
Last you wake up thinking you finished your project but quickly getting a grip on what had happend.
This Happened way too many times to me.
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When you remodel a house, and are a little surprised that when you take out a wall, there isn't nodraw behind it, just a lot of pointless detail
When suddenly you realise that you are actually mapping more than playing the game!
Today I've checked that my hours mapping are the same than my hours playing Portal2!! my god.
useful tools and stuff here on TWP 
[spoiler]
[/spoiler]
Oh shoot! While I have played both Portal 2 and Hammer significantly less than you have, I might be in trouble:
Portal 2: 10.5 hrs last two weeks / 126 hrs on record
Portal 2 Authoring Tools - Beta: 52.6 hrs last two weeks / 404.3 hrs on record
That's 3,2 times as much Hammer!
Maps in Development:
[spoiler]- Penrose 04 (on hold)[/spoiler]
I usually constantly run Portal2 as I map so I have:
PortalStories.com
"Oh, in case you got covered in that repulsion gel, here's some advice the lab boys gave me: DO NOT get covered in the repulsion gel."
hehehehehe.... that was funny!
useful tools and stuff here on TWP [spoiler]
[/spoiler][quote="iWork925
[/quote]
Looks like he is died before he finished his work.
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