The time required to pay into the pension system was reduced from 25 years to 10 years.
必要期間が25年→10年に短縮「年金10年」手放しで喜べない2つの理由|たあんと
Yes, but that's the minimum time to be vested--it was 25, and is now ten years. But that doesn't mean you can stop paying after ten years...! As long as you're still here, you're liable/responsible for paying in.
OP should take their pension number to their local pension office, take a number and talk to someone there. They will plug that into their system and can print out your history, and they can tell you what benefit you'd be getting if you were retired now.
The fact that the workers might have just been rotated there is ridiculous--they're not going to put some clueless person out to face the public. There may be a chance you'll see a pair of people (one in training), and even if you get someone who is very experienced, they still may have to step away to clarify something with another worker there.
It is possible to receive up to a maximum of 65,000 per month on the Kokumin Nenkin and up to a maximum of 100,000 per month on the Kousei Nenkin.
With 29 years paid in, I receive ¥76,577 every other month that's tagged as 国民厚生年金 in my bankbook (40 years of payments are necessary for the max payout). The larger chunk comes from the 私立学校 system--¥256,813 and again that's the bimonthly figure (this was ¥5000 higher last year). Do the math and I now get ¥166,695/month.
An insurance-like aspect of the pension system comes into effect if you happened to become disabled (one of the established levels of disability here). I'm not disabled, but I've heard that you are eligible to begin collecting your full pension earlier. I think there are some other differences, besides that (e.g., how your contribution is calculated). Also, if you are officially institutionalized, I think the payout is increased to help pay those costs.
I ended up staying in Japan. Based upon a figure that I've seen, in a short time from now, my pension (Japanese) will be about 32000 yen paid every 2 months.
Luckily I get American Social Security which is not enough to live really in Japan, but...
I'm not eligible for any SS, since I've never really worked in the US. Based on a colleague's experience here who is collecting both, SS will reduce your payment/benefit if you're collecting another pension (and don't think they "just won't know" about your pension here!). They don't approve of people who are double-dipping.