fix

@@ -10,7 +10,7 @@ function sleep(ms) {
   })
 }
 
-const TWENTY_MINUTES = 10 * 60 * 1000
+const TEN_MINUTES = 10 * 60 * 1000
 
 function getRandomInt(max) {
   return Math.floor(Math.random() * Math.floor(max));
@@ -21,14 +21,14 @@ function main() {
   ruleIn.hour = 9
 
   schedule.scheduleJob(ruleIn, function(){
-    sleep(getRandomInt(TWENTY_MINUTES)).then(checkin)
+    sleep(getRandomInt(TEN_MINUTES)).then(checkin)
   });
 
   const ruleOut = new schedule.RecurrenceRule()
   ruleOut.hour = 18
 
   schedule.scheduleJob(ruleOut, function(){
-    sleep(getRandomInt(TWENTY_MINUTES)).then(checkout)
+    sleep(getRandomInt(TEN_MINUTES)).then(checkout)
   });
 
   console.log('checkin start')