Type your comment> @TazWake said:
I think something is going wrong here. It shouldn’t take 9999 attempts to brute force it and although Burp Intruder is slow (especially if you have the free product), it shouldn’t take 8 hours.
If the responses are timing out, then the server isn’t responding. Thats a server problem (maybe the lab has crashed) rather than something at your end.
So while I was doing another lab I found out that you don’t need to have a request on hold, you can just leave it. I had a request intercepted and being held. By the way, does burp stop if you get logged out automatically in kali?