Index: Makefile.inc1
===================================================================
--- Makefile.inc1
+++ Makefile.inc1
@@ -1575,6 +1575,11 @@
 
 ${WMAKE_TGTS:N_worldtmp:Nbuild${libcompat}} ${.ALLTARGETS:M_*:N_worldtmp}: .MAKE .PHONY
 
+# record kernel(s) build time in seconds
+.if make(buildkernel)
+_BUILDKERNEL_START!= date '+%s'
+.endif
+
 #
 # buildkernel
 #
@@ -1631,7 +1636,12 @@
 	@echo "--------------------------------------------------------------"
 	@echo ">>> Kernel build for ${_kernel} completed on `LC_ALL=C date`"
 	@echo "--------------------------------------------------------------"
+	
 .endfor
+	@seconds=$$(($$(date '+%s') - ${_BUILDKERNEL_START})); \
+	  echo -n ">>> Kernel(s) build for${BUILDKERNELS} in $$seconds seconds, "; \
+	  echo "ncpu: $$(sysctl -n hw.ncpu)${.MAKE.JOBS:S/^/, make -j/}"
+	@echo "--------------------------------------------------------------"
 
 NO_INSTALLEXTRAKERNELS?=	yes