It is once per second, not every 10 seconds.

[skip ci]

2 files changed, 2 insertions, 2 deletions

diff --git a/tcpdump.1.in b/tcpdump.1.in
index eb0599e5..51beccb8 100644
--- a/tcpdump.1.in
+++ b/tcpdump.1.in
@@ -728,7 +728,7 @@ IP and ICMP header checksum.
 .IP
 When writing to a file with the
 .B \-w
-option, report, every 10 seconds, the number of packets captured.
+option, report, once per second, the number of packets captured.
 .TP
 .B \-vv
 Even more verbose output.
diff --git a/tcpdump.c b/tcpdump.c
index 3a39716b..520d69f7 100644
--- a/tcpdump.c
+++ b/tcpdump.c
@@ -2082,7 +2082,7 @@ main(int argc, char **argv)
 	if (ndo->ndo_vflag > 0 && WFileName && !print) {
 		/*
 		 * When capturing to a file, if "--print" wasn't specified,
-		 *"-v" means tcpdump should, every 10 seconds,
+		 *"-v" means tcpdump should, once per second,
 		 * "v"erbosely report the number of packets captured.
 		 */
 #ifdef USE_WIN32_MM_TIMER