Hi Mr.RS4,
Sorry for the delayed reply.  Been out on business travel in N. Ireland.  Unfortuntately, not pool/billiards related.  
 
To answer your questions:
1.  The length of time they stay on the table varies.  I've received feedback from several users who had an application on 3+ months, some longer.  Kit comes with a roll of 200 labels and you can get more when you run out.
2.  Complete 8-9-10-ball system is 32.95 + shipping... The 9-10-ball system is 24.95 + shipping (USD).  Shipping to Norway will be $28 additional.  You may want to check with 
http://www.pro9.co.uk to see if they have a better deal on shipping for international.
Regards,
Abe - i4pool
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