How does custom event listener work.

Hi,
With reference to Custom Event Listener, I wanted to know the behaviour of Custom Listener whether they are sync or async.
For Example :
Suppose i have a method1() which has the listener1() get invoked at some operation at line #1 of method();
The task of listener1() takes 2 minutes aprox.
Then my question is does method1() waits until listener1() finishes its task(2 Minutes) ?
What is he default behavior of listner1()
Can we change the default behavior of custom listners ?
Thanks & Regards,

jwenting wrote:
rephrase your question in gramatically (and preferably syntactically) correct English so people can actually understand what you're asking.You took the words straight out of my mouth
Mel

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