What would I see if...

[eaglgenes101]

... the planck constant suddenly changed to 6.626 * 10^-4 m^2 kg / s ?
(Assume that I'm still alive and can see, hear, etc.)

[andretimpa]

You increased h by a factor of 10^30, this increases the planck lenght by 10^15 (so you still wouldn't see quantum gravity effects), but assuming things keep the same energy/momentum, then particle wavelenghts would be increased by a factor of 10^30. As the nucleus in an atom is about 10^-15 m, you can expect a world dominated by quantum effects for sizes up to 10^15 m, which  is thousands of times the size of the solar system.

So there's probably not much to be seen

[eaglgenes101]

How about if it were a more modest 6.626 * 10^-24 J*s ?

Would it resemble an ETG desync?

[andretimpa]

The length scales we are used to would have effects similar to the ones seen in molecules. I don't know what you'd see but it would be fairly weird.

To give you an idea: http://www.rsc.org/chemistryworld/News/2009/August/27080902.asp

[eaglgenes101]

Bmup