Hi there @ekhan5!
Your Fido's bill cycle is set when you create it, and the day on which it falls (weekends or weekdays) will vary each month 
With that said, some payments methods such as online banking can take 3 to 5 business days to be processed. In which case, we would suggest taking that delay in consideration. For more info, see this link.
Keep in mind that your bill payment can be made at your convenience as soon as the invoice is available, there is no need to wait until the due date. You can also process payments using a credit card for example, which is applied immediately to your account.
Hope this helps!
