diff --git a/doc/chrony.conf.adoc b/doc/chrony.conf.adoc
index 6c39635..786fdcd 100644
--- a/doc/chrony.conf.adoc
+++ b/doc/chrony.conf.adoc
@@ -200,7 +200,7 @@ presend 9
 ----
 +
 when the polling interval is 512 seconds or more, an extra NTP client packet
-will be sent to the server a short time (4 seconds) before making the actual
+will be sent to the server a short time (2 seconds) before making the actual
 measurement.
 +
 The *presend* option cannot be used in the *peer* directive.
diff --git a/ntp_core.c b/ntp_core.c
index 07673e8..7cdcd70 100644
--- a/ntp_core.c
+++ b/ntp_core.c
@@ -223,7 +223,7 @@ static ARR_Instance broadcasts;
 #define IBURST_TOTAL_SAMPLES SOURCE_REACH_BITS
 
 /* Time to wait after sending packet to 'warm up' link */
-#define WARM_UP_DELAY 4.0
+#define WARM_UP_DELAY 2.0
 
 /* Compatible NTP protocol versions */
 #define NTP_MAX_COMPAT_VERSION NTP_VERSION
diff --git a/test/simulation/114-presend b/test/simulation/114-presend
index 1371aa8..3113253 100755
--- a/test/simulation/114-presend
+++ b/test/simulation/114-presend
@@ -3,7 +3,7 @@
 . ./test.common
 test_start "presend option"
 
-min_sync_time=140
+min_sync_time=136
 max_sync_time=260
 client_server_options="presend 6 maxdelay 16"
 client_conf="maxdistance 10"