noun, noun which may take the genitive case particle 'no'
lifetime supply; lifetime's worth
Used for an amount so large that it would last a lifetime, often with a nuance of exaggeration.
If I win the lottery, I'll get a lifetime's worth of money.
This book contains a lifetime's worth of wisdom.
Compound of 一生 (いっしょう, 'one's whole life') and 分 (ぶん, 'portion, amount').