-Choose Server Manager > Tools > DNS.-Expand the DNS Console.-Expand the server to display the Forward Lookup Zones and Reverse Lookup Zones folders.-To view additional options, click View > Advanced.-To modify a record, double-click a resource record. The Properties dialog box opens.-Type the TTL using the DDDDD:HH.MM.SS format, where DDDDD is days, HH is hours, MM is minutes, and SS is seconds.