How much jet lag from Chennai to Mumbai?
Same time zone — little to no jet lag on this route.
Chennai and Mumbai sit in the same time zone, so there is essentially no clock change to recover from. Ordinary travel fatigue aside, your body clock stays put.
Mumbai is the same time as Chennai. See the full Chennai ⇄ Mumbai time difference, and the return trip (Mumbai → Chennai).
Chennai and Mumbai are in the same (or nearly the same) time zone, so you should feel little to no jet lag on this route.
Eastward (advancing your clock) is generally harder than westward (delaying it), because it is easier to stay up late than to force sleep early. This trip is neither — same time zone.
Shift your sleep by an hour or two toward the destination a few days before you fly, get bright light at the right end of the day (morning light to wake earlier going east; evening light to stay up later going west), avoid alcohol on the flight, and — critically — hold a fixed wake-up time once you land, even if you slept badly. A consistent, unmissable morning alarm is what re-anchors your body clock.
Very quickly — there is essentially no time change on this route.
Not because it rings louder. Because it removes every way your half-asleep brain talks you back into bed.
Swiping an alarm away is a reflex you can perform while still asleep. A mission needs your thinking brain switched on — and once it is on, sinking back under is much harder.
Force-quit the app, restart the phone, flip it to silent, turn the volume down. The alarm re-arms and keeps going until the mission is actually done.
Photo and barcode missions are anchored to a spot in another room, so the only way to stop the noise is to stand up and walk there. You cannot pre-stage it from bed.
A sleep forecast before bed, bedtime reminders and wake-up streaks — because the 6 AM problem usually starts at 1 AM.
Captain Wake makes you complete a real-world mission to silence the alarm — so your new schedule sticks from day one.