What’s the time gap between “Paging Request Type 1” and “Immediate Assignment” in 2G/GSM MTC?

In 2G/GSM MTC (Mobile Terminating Call) packets, what is the time duration between the frame “Paging Request Type 1” and “Immediate Assignment” ?

What is the time duration between the frame “Paging Request Type 1” and “Immediate Assignment”?