Index: src/tests/preempt_longrun/Makefile.am
===================================================================
--- src/tests/preempt_longrun/Makefile.am	(revision 32cab5b7850de1e6632f51e472d84eee06963594)
+++ src/tests/preempt_longrun/Makefile.am	(revision b9da958543715a012aa064957559bd6daf3afa63)
@@ -17,5 +17,5 @@
 repeats=10
 max_time=600
-preempt=1_000ul
+preempt=10ul\`ms
 debug=-debug
 
Index: src/tests/preempt_longrun/Makefile.in
===================================================================
--- src/tests/preempt_longrun/Makefile.in	(revision 32cab5b7850de1e6632f51e472d84eee06963594)
+++ src/tests/preempt_longrun/Makefile.in	(revision b9da958543715a012aa064957559bd6daf3afa63)
@@ -450,5 +450,5 @@
 repeats = 10
 max_time = 600
-preempt = 1_000ul
+preempt = 10ul\`ms
 debug = -debug
 REPEAT = ${abs_top_srcdir}/tools/repeat
Index: src/tests/preempt_longrun/create.c
===================================================================
--- src/tests/preempt_longrun/create.c	(revision 32cab5b7850de1e6632f51e472d84eee06963594)
+++ src/tests/preempt_longrun/create.c	(revision b9da958543715a012aa064957559bd6daf3afa63)
@@ -1,9 +1,8 @@
 #include <kernel>
 #include <thread>
-
-static const unsigned long N = 60_000ul;
+#include <time>
 
 #ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10`ms
+#error PREEMPTION_RATE not defined in makefile
 #endif
 
@@ -11,4 +10,6 @@
 	return PREEMPTION_RATE;
 }
+
+static const unsigned long N = 60_000ul;
 
 thread worker_t {};
Index: src/tests/preempt_longrun/enter.c
===================================================================
--- src/tests/preempt_longrun/enter.c	(revision 32cab5b7850de1e6632f51e472d84eee06963594)
+++ src/tests/preempt_longrun/enter.c	(revision b9da958543715a012aa064957559bd6daf3afa63)
@@ -2,9 +2,8 @@
 #include <monitor>
 #include <thread>
-
-static const unsigned long N  = 2_100_000ul;
+#include <time>
 
 #ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10`ms
+#error PREEMPTION_RATE not defined in makefile
 #endif
 
@@ -12,4 +11,6 @@
 	return PREEMPTION_RATE;
 }
+
+static const unsigned long N  = 2_100_000ul;
 
 monitor mon_t {};
Index: src/tests/preempt_longrun/enter3.c
===================================================================
--- src/tests/preempt_longrun/enter3.c	(revision 32cab5b7850de1e6632f51e472d84eee06963594)
+++ src/tests/preempt_longrun/enter3.c	(revision b9da958543715a012aa064957559bd6daf3afa63)
@@ -2,9 +2,8 @@
 #include <monitor>
 #include <thread>
-
-static const unsigned long N  = 500_000ul;
+#include <time>
 
 #ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10`ms
+#error PREEMPTION_RATE not defined in makefile
 #endif
 
@@ -12,4 +11,6 @@
 	return PREEMPTION_RATE;
 }
+
+static const unsigned long N  = 500_000ul;
 
 monitor mon_t {};
Index: src/tests/preempt_longrun/processor.c
===================================================================
--- src/tests/preempt_longrun/processor.c	(revision 32cab5b7850de1e6632f51e472d84eee06963594)
+++ src/tests/preempt_longrun/processor.c	(revision b9da958543715a012aa064957559bd6daf3afa63)
@@ -1,9 +1,8 @@
 #include <kernel>
 #include <thread>
-
-static const unsigned long N = 5_000ul;
+#include <time>
 
 #ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10`ms
+#error PREEMPTION_RATE not defined in makefile
 #endif
 
@@ -11,4 +10,6 @@
 	return PREEMPTION_RATE;
 }
+
+static const unsigned long N = 5_000ul;
 
 int main(int argc, char* argv[]) {
Index: src/tests/preempt_longrun/stack.c
===================================================================
--- src/tests/preempt_longrun/stack.c	(revision 32cab5b7850de1e6632f51e472d84eee06963594)
+++ src/tests/preempt_longrun/stack.c	(revision b9da958543715a012aa064957559bd6daf3afa63)
@@ -1,9 +1,9 @@
 #include <kernel>
+#include <math>
 #include <thread>
-
-#include <math>
+#include <time>
 
 #ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10`ms
+#error PREEMPTION_RATE not defined in makefile
 #endif
 
Index: src/tests/preempt_longrun/yield.c
===================================================================
--- src/tests/preempt_longrun/yield.c	(revision 32cab5b7850de1e6632f51e472d84eee06963594)
+++ src/tests/preempt_longrun/yield.c	(revision b9da958543715a012aa064957559bd6daf3afa63)
@@ -1,4 +1,13 @@
 #include <kernel>
 #include <thread>
+#include <time>
+
+#ifndef PREEMPTION_RATE
+#error PREEMPTION_RATE not defined in makefile
+#endif
+
+Duration default_preemption() {
+	return PREEMPTION_RATE;
+}
 
 #ifdef LONG_TEST
@@ -7,12 +16,4 @@
 static const unsigned long N = 325_000ul;
 #endif
-
-#ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10`ms
-#endif
-
-Duration default_preemption() {
-	return PREEMPTION_RATE;
-}
 
 thread worker_t {};