diff --git a/code/nrf-connect/samples/ble/Kconfig b/code/nrf-connect/samples/ble/Kconfig
index 15cc887..4f063b8 100644
--- a/code/nrf-connect/samples/ble/Kconfig
+++ b/code/nrf-connect/samples/ble/Kconfig
@@ -2,12 +2,12 @@
 source "Kconfig.zephyr"
 rsource "../../prstlib/Kconfig"
 
-config PRST_SLEEP_DURATION_SEC
-	int "Sleep duration in seconds"
+config PRST_SLEEP_DURATION_MSEC
+	int "Sleep duration in milliseconds"
 	default 600
 
-config PRST_BLE_ADV_DURATION_SEC
-	int "Advertising duration in seconds"
+config PRST_BLE_ADV_DURATION_MSEC
+	int "Advertising duration in milliseconds"
 	default 1
 
 config PRST_BLE_MIN_ADV_INTERVAL
diff --git a/code/nrf-connect/samples/ble/README.md b/code/nrf-connect/samples/ble/README.md
index a05d937..4d237bd 100644
--- a/code/nrf-connect/samples/ble/README.md
+++ b/code/nrf-connect/samples/ble/README.md
@@ -8,7 +8,7 @@ Available configurations and their default values are in [`Kconfig`](./Kconfig).
 To save energy, the board spends most of the time in a "deep sleep" state, in which most peripherals and radio are completely turned off. The period of sleep is controlled by the `PRST_SLEEP_DURATION_SEC` config.
 
 ### Advertising Duration
-When it wakes up, the sample reads all sensors and keep broadcasting advertising packets for `PRST_BLE_ADV_DURATION_SEC` before going back to sleep.
+When it wakes up, the sample reads all sensors and keep broadcasting advertising packets for `PRST_BLE_ADV_DURATION_MSEC` before going back to sleep.
 
 ### Advertising Packet Encoding
 There are different ways to encode the sensor data in a BLE advertising packet.
diff --git a/code/nrf-connect/samples/ble/src/main.c b/code/nrf-connect/samples/ble/src/main.c
index 8f731cd..a87b814 100644
--- a/code/nrf-connect/samples/ble/src/main.c
+++ b/code/nrf-connect/samples/ble/src/main.c
@@ -26,7 +26,7 @@ static int prst_loop(prst_sensors_t *sensors) {
   RET_IF_ERR(prst_sensors_read_all(sensors));
   RET_IF_ERR(prst_ble_adv_set_data(sensors));
   RET_IF_ERR(prst_ble_adv_start());
-  k_sleep(K_SECONDS(CONFIG_PRST_BLE_ADV_DURATION_SEC));
+  k_msleep(CONFIG_PRST_BLE_ADV_DURATION_MSEC);
   RET_IF_ERR(prst_ble_adv_stop());
   return 0;
 }
@@ -37,6 +37,6 @@ int main(void) {
   prst_sensors_t sensors;
   while (true) {
     __ASSERT(!prst_loop(&sensors), "Error in prst_loop()");
-    k_sleep(K_SECONDS(CONFIG_PRST_SLEEP_DURATION_SEC));
+    k_msleep(CONFIG_PRST_SLEEP_DURATION_MSEC);
   }
 }