Usually it's one bill. But even if it weren't it's not a problem because the bill goes straight to my bank and I pay by direct debit. The bank notifies me in plenty of time by email. We don't use paper bills and invoices much in Norway any more. After the first one or two from a new supplier most people switch to email billing and direct debit (eFaktura and Avtalegiro).

I just get one bill, even though in my case it's two companies (because I shopped around)