Index: Makefile.inc1
===================================================================
--- Makefile.inc1
+++ Makefile.inc1
@@ -1376,6 +1376,10 @@
 
 ${WMAKE_TGTS:N_worldtmp:Nbuild${libcompat}} ${.ALLTARGETS:M_*:N_worldtmp}: .MAKE .PHONY
 
+.if make(buildkernel)
+_BUILDKERNEL_START!= mktemp -t buildkernel
+.endif
+
 #
 # buildkernel
 #
@@ -1388,6 +1392,7 @@
 .endif
 	@echo
 .for _kernel in ${BUILDKERNELS:Ndummy}
+	@date '+%s' > ${_BUILDKERNEL_START}
 	@echo "--------------------------------------------------------------"
 	@echo ">>> Kernel build for ${_kernel} started on `LC_ALL=C date`"
 	@echo "--------------------------------------------------------------"
@@ -1429,8 +1434,13 @@
 	${_+_}cd ${KRNLOBJDIR}/${_kernel}; ${KMAKE} all -DNO_MODULES_OBJ
 	@echo "--------------------------------------------------------------"
 	@echo ">>> Kernel build for ${_kernel} completed on `LC_ALL=C date`"
+	@seconds=$$(($$(date '+%s') - $$(cat ${_BUILDKERNEL_START}))); \
+	  echo -n ">>> Kernel build for ${_kernel} in $$seconds seconds, "; \
+	  echo "ncpu: $$(sysctl -n hw.ncpu)${.MAKE.JOBS:S/^/, make -j/}"
 	@echo "--------------------------------------------------------------"
+	
 .endfor
+	rm -f ${_BUILDKERNEL_START}
 
 NO_INSTALLEXTRAKERNELS?=	yes