That means that to send a 0,05 BTC i need a maturation of 2592 confirmations/ 150conf/day = 18 DAYS
To send a 0,1 about 9 DAYS
To send a 0,5 about 2 days
To send 1 BTC about 0,9 days
To send 10+ BTC, almost immediately.
Technically the amount your sending doesn't matter it is the amount you are sending FROM.
So if you receive 0.1 BTC you need to wait 9 days to use it.
If you receive 0.5 BTC you need to wait 2 days to use it.
If you receive 1 BTC you need to wait about 0,9 days
If you receive 10+ BTC, you can send them right away.
If you send an amount from two addresses as the input then the "bitcoin days" from each input combine to meet the "free" threshold.
Also note there is ALWAYS a fee for very small transactions (<0.01 BTC) to avoid "dust spam" attack. An infinite amount of time won't eliminate that fee.