The Globe recently took this question, and we thank them for their input. We have included a little more with links.
Phone bills should be sent about 33 days before they are due, and the bill should reflect a 30 day period to pay the bill. DPU 18448
Cable bills are a little confusing, as due dates can be as little as 5 days from the date of mailing, but the customer is not delinquent until 30 days from the bill due date. 207 CMR 10.05.
Gas and electric utilities regulations are such that the due date is 45 days from the billing, or the time between receipt of the last bill, whichever is greater. (a little confusing) 220 CMR 25.02.
Credit card bills are due 21 days from the date of the bill. Consumer Finance Protection Agency (federal).
For related information see our Debt Collection and Credit and Banking pages.