I find multiplying the time estimate by Pi gives a more realistic looking number... :)

5 - 20 seconds?!?! You must have a pretty high end machine... Mine takes at least a minute to load, and then another minute of looking around before it's finished caching all the textures (heaven forbid there be some important dialogue during this time that I'd like to hear over the stuttering...) and i can get back to game playing...

If you want to see what a real game using the source engine looks like check out Vampire - Masquerade (sp?). And there's no authentication to boot! :)

cheers