This depends on your version of IOS. You could do this with the "wait" action, but that will only work with EEM 3.0 and higher (plus you'd need to increase your maxrun time). A way that will work with all versions of EEM is using two applets:
event manager environment q "
!
action 1.1 cli command "enable"
action 1.2 cli command "conf t"
action 1.3 cli command "interface g0/0"
action 1.4 cli command "shut"
action 1.5 syslog msg "Interface GigabitEthernet 0/1 shutdown"
action 1.6 cli command "event manager applet noshut-countdown"
action 1.7 cli command "event timer countdown time 30"
action 1.8 cli command "action 1.0 cli command enable"
action 1.9 cli command "action 2.0 cli command $q config t$q"
action 2.0 cli command "action 3.0 cli command $q interface g0/0$q"
action 2.1 cli command "action 4.0 cli command $q no shut$q"
action 2.2 cli command "action 5.0 cli command $q no event manager applet noshut-countdown$q"
action 2.3 cli command "end"