It only takes a few minutes to sign up for paperless billing. You'll continue to receive a paper invoice until your paperless request takes effect, which usually happens within two billing cycles. Signing up for paperless billing doesn't change your monthly due date.
If you want to further reduce the time you spend managing your invoices, you can set up a recurring payment. We call this Autopay and, when you enroll in Autopay, your payment is automatically debited from a bank account or charnged to a credit/debit card each month.