Set TimeoutSeconds to the maximum amount of time you want to permit. The default is 0, in which case Execute will not timeout.

public int TimeoutSeconds;

Public Property TimeoutSeconds() As Integer

When this time is exceeded, Execute will halt leaving incomplete results in the OutputFile or OutputString. If TimeoutSeconds is 0 (the default), no time limit will be set. After a timeout has occured, the Errors property will contain an message code dtsErTimeout.