Hi, Jeevan!
Not to worry! There isn't a set schedule for
Complimentary Resort Transportation at Walt Disney World, including Resort Buses. Instead, you can be sure that these buses begin running from each WDW resort about an hour before each park opens, and remain running until about an hour after each park closes. Buses then continue to run throughout the day, typically about every 20 minutes.
These schedules are approximate, though, as we've seen several buses going to the same park stop at our resort bus stop within just a minute of each other; we've also waited longer than 20 minutes on occasion, too. The bottom line? Transportation is available on a continuous basis throughout the day.
Hope this helps!
Send more questions as you think of them, too, Jeevan. We love to help!