Index: qscan.nse
===================================================================
--- qscan.nse	(revision 19518)
+++ qscan.nse	(working copy)
@@ -388,7 +388,9 @@
 	-- account some of the RTT differences, but I think it really depends
 	-- on how many ports were scanned and how many were forwarded where.
 	-- Play it safer here.
-	pcap:set_timeout(2 * host.times.timeout * 1000)
+	local read_timeout = 2 * host.times.timeout * 1000
+	-- add a couple of extra seconds to the timeout for the first read only.
+	pcap:set_timeout(read_timeout + 2000)
 
 	local tcp = genericpkt(host)
 
@@ -419,6 +421,11 @@
 			stats[j].sent = stats[j].sent + 1
 
 			local status, len, _, pkt, stop = pcap:pcap_receive()
+			
+			-- reset the timeout after the first read has been completed.
+			if i==1 and j==1 then
+				pcap:set_timeout(read_timeout)
+			end
 
 			if not stop then
 				-- probably a timeout, just grab current time