GTS Reset Sequencer IP o_refclk_on_ack

Hi, I am using Quartus ver 26.1 PRO Edition and investigating the GTS Reset Sequencer IP.
In the figure below, o_refclk_on_ack is described as a pulse. Is there a specified minimum pulse width for this signal? 
For example, would it be safe to sample this pulse with a 100 MHz clock, or is there a possibility that the pulse width could be shorter than that?

3.7.6. Guidelines for Obtaining the Real-Time GTS TX PLL Lock Status