DW1000: What is the minimal low time of the interrupt when double buffer is used

Dear Decawave,

I kindly ask for assistance regarding double buffer reception of DW1000.
I have actually a simply question: Please have a look at the attached picture. The timing in question is the minimal low time of the DW1000 interrupt we have to expect when the interrupt gets de-asserted and asserts again in case the other buffer is at this time is already filled.

I need to know this minimal low time in order to use the right capture mechanism of the DW1000 interrupt in our microcontroller. We usually use a edge triggered input. Successfull edge detection relys on sampling rate of the input and the minimal low time of the signal to expect.
Probably the minimal interrupt low time is even 0 seconds, then a edge trigger cannot be used at all.

You see we need the timing of minimal low time of the DW1000 interrupt to make it right.

Many thanks in advance.

regards