Can i leave the bank account unreconciled in a month to be reconciled in another month?

Hi there, 

Reconciliation is an important step in your business health. Ensuring that your books match the bank means that you'll feel confident knowing nothing's been missed. Sometimes you're not able to reconcile the current month until a later date. No problem! QuickBooks Online knows how busy your life is as an entrepreneur.

When you begin your reconciliation, the system will ask for your ending date. If you're reconciling the month of October in November, for instance, you'll set the ending date as October 31st. Keep in mind, your reconciliations will move in chronological order. You have to reconcile October before you can reconcile November.

I hope this helps get you back on track. For more information about reconciling in QuickBooks Online, take a look at this article: Reconcile accounts. 

If you have any other questions, let me know. 

Cheers.