The notification of 'Exchange' shows the start time, but doesn't show the end time. From Nsave support I learned that it is between 7 AM - 1 PM (GMT)

So, if anyone opens the exchange option at 2 PM GMT (like me) for several days, they will see that, it only works after 1 PM of the next day. But when they open the Exchange option next day at 2 PM GMT, they will see that it will open after 1 PM GMT next day. But as there is no end time in the notification, they will thought '2 PM is after 1 PM, why it is not working?'

That's why, please add the end time in this notification "7 AM to 1 PM"

I am attaching the screenshot from Bangladesh time here (GMT+6). So, don't confuse it with the GMT time I have told above.