AC, oi scout are din ako

i have a couple of questions....

1. let's say i load P250 of 24/7 credit, then P100 of 24/7, will i get 40 days worth of unlimited calls/sms from sun-to-sun? which leads me to my next question...

2. can i mix and match 24/7 credit with regular credit?

TIA M2 and PK