By default the XOT connection is kept alive for 60 seconds and also based on keepalive retry count set.For changing this time the following commands can be used:

1)xot-keepalive-period seconds

seconds-the number of seconds for keepalives between Xot connections.60 seconds is default

2)xot-keepalive-tries count

count-represents the number of times the keepalive message should be sentt before dropping the connection.By default it is 4 times.

For more information about XOT timer configuration with examples refer the following URL:

http://www.cisco.com/en/US/docs/ios/12_3/wan/command/reference/wan_x1g.html#wp1033412