Update LAB[PL-200] Business rule lab instructions

Added estimated completion time for the lab.

Author: anjenni

Instructions/Labs/LAB[PL-200]_M07L01_Business_rule.md

@@ -12,6 +12,8 @@ You are a Power Platform functional consultant and have been assigned to the Fab
 
 In this practice lab, you will be creating business rules to show and hide the lookup columns in the model-driven app form for the Resource table and to set the status of Milestone rows to completed when the percentage complete is 100%. You will also create a low-code plug-in to validate dates.
 
+This lab will take approximately **45** minutes to complete. 
+
 ## Exercise 1 – Create business rules
 
 ### Task 1.1 – Create Resource business rules