how long should my battery last before breaking

i have g752vt but im worried about battery replacement asus told sending it back to manufacturer and repairing cost a whooping 700 canadian dollar$ omg.!?

@quebec946: You don't replace a laptop battery, it costs too much, for a bit more you could get another gaming laptop.

$116 shipped - http://www.able-buy.com/88wh-asus-g752vt-battery-replacement-p-60115.html?gclid=Cj0KEQjwosK4BRCYhsngx4_SybcBEiQAowaCJbfwYA-c4f8FDOoHskRDk9qtfh7YV7XatOUbaEI-sioaAmPZ8P8HAQ