how to rerun from failed child package from execute package task in foreachloop container in masterpackage after wait for 30minutes without failing the masterpackage

hey we have master package, in that foreachloop is there and in that executepackage task is there. we are running almost 30 child packages
from masterpackages. what the issue is becasue of some network issue, sometimes it is not connectiing to source server in oledbsource in some child packages,
so master package execution fails.
my requirement is when package fails because of network issue i.e. if execute package task fails(means child package fails) in foreachloop container,
then it should wait for 30 minutes like that and again need to run execute pacakge task from the same failed package how.

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tsrkreddy