A lot of that has to do with costs and service levels provided by your DNS provider. There's a couple of good points at Server Fault: http://serverfault.com/que

A lot of that has to do with costs and service levels provided by your DNS provider. There's a couple of good points at Server Fault: http://serverfault.com/questions/388289/what-are-the-benefits-of-a-high-ttl-for-dns http://serverfault.com/questions/388289/what-are-the-benefit...