Also, though I've got a general idea, how much yen go's to the american dollar, meaning, exchange rate. Just wondering. I know in japan I'll be making yen, but since I don't live in japan yet, and I do wish to visit japan sometime, I'd like to know.

Also, what is the normal work week(hours and days) and what is minimum wage there?

$1 is about 89.3 I Just think ￥100 is 100 ¢

I think minimum wage is like $5.00 but not sure

I think you are talking about the tourist visa which is valid for three months. In that case the answer is yes. If you leave the country then return, you just get another tourist visa coming in. A work visa I believe has to be sponsored by your employer or a proof of employment so the answer in that case would be no.

the current dollar-yen exchange rate as of today is

$1 - 120.75yen

minimum rate? Last time I know was between 700yen to 1000yen per hour .. am not sure how much right now ( if there is any changes )

The current exchange rate is 121.42 yen to the US dollar. One easy way to calculate the exchange, go to google and type in 1 usd in yen. Or you can enter the amount of yen and get the US dollar equivalent by typing yen in usd.

Currently, 10,000 yen (a man) equals 80 bucks. At 110 to the dollar, it would be 90 and of course at 100 it would be 100 dollars.

This will make a huge difference when you start changing a lot of money one way or the other. For example if I change 1,000 US to yen right now it would be about 121,000 yen. Then maybe I wait till the dollar falls and the yen strengthens to 110 to the dollar and I have made a hundred dollars switching back and forth.

Yeah I had that backwards my bad :D

Really? The last time I renewed my visa, they had signs posted everywhere about how they were no longer issuing re-entry permits for over a year, regardless of how long the visa you had was. I was planning to apply for a 3 year re-entry permit when I picked up my visa, but as they were no longer issuing anything longer than a year, I didn`t bother.

Now that I looked into it, yes, it is for if you`re married. Oops. I`m married to a Japanese national, so I`ve never so much as looked at the requirements for if you`re not. So, yes, it does seem that you`d have to have lived in Japan for over 10 years before applying if you`re single or married to someone who isn`t Japanese.

then it's settled:D
you can always manage somehow..

Im thinking around 250,000 if you want to live with the basics, in a city like Tokyo

what do you consider "basics" ?