You take how long you are expected to live and multiply it times two. That means you'll be able to view your web page two times longer. That's the best answer.
I would like to suggest you to refer this site http://kb.mediatemple.net/questions/908/Understanding+TTL+(time-to-live)
Time-to-live (TTL) is a value in an Internet Protocol (IP) packet that tells a network router whether or not the packet has been in the network too long and should ...
It's basically the number of routers the packet can travel through. Each router subtracts 1 from the TTL before sending the packet on to the next node. If a node receives a packet with a 0 TTL, it ignores the packet and the packet dies.
Yes, I usually send my packets via UPS or FedEx and they drop them off one by one. Thus subtracting one packet at every stop.
Time to live is a mechanism that limits the lifespan of data in a computer or network.Time to live may be implemented as a counter or timestamp attached to or embedded in the data.Once the prescribed event count or timespan has elapsed,data is discarded.In computer networking,Time to live prevents a data packet from circulating indefinitely.
TTL is that little whisp of smoke that drifts through the ether and lands on the soft delicate fields of Wyoming.
The capability of the DNS servers to cache DNS records is called TTL Time to live. The maximum TTL time is 86400 seconds (24 hrs). The longer the TTL value is, the faster