Tell us what type of lifestyle or type of travel comfort you prefer and we can give you a better sense of how much you might spend. To give you an example of how ridiculous the range of spending might be, had a couple of old college buddies come in to visit a few weeks ago, we're all mid-career now but aren't above hanging out/eating wherever.

1st Night:
Super-Local hotpot/northern China restaurant, ordered about seven dishes, plus about ten beers
Total: 120Y

2nd Night:
Similar amount of food and drink at a more 'upscale' place
Total: 800Y

Crazy extremes, everything is like that in living in the middle kingdom.