Sorry, if this has been asked before, but I couldn’t find an answer anywhere I was looking for it. 
I’ve once read somewhere that when one upgrades his subscription from annual to lifetime the price of the time left on the annual subscription is subtracted from the price of the lifetime one (e.g. if there’s $50 worth of time left on the annual subscription the final price for the lifetime one would be $299 - $50 = $249).
Is this true and, if so, does the same apply when upgrading from monthly subscription to annual or should I wait until I use the entire amount of time on my monthly subscription and purchase the annual one after it runs out? 
