Net 30, Net 60, and Net 90 are the standard shorthand. The number is the days allowed; the difference between them is entirely a question of whose cash sits where.
What matters as much as the number is when the clock starts. Days from invoice date, from receipt of invoice, and from acceptance of the work are three very different deadlines — and the last one can be indefinite if acceptance criteria are vague. Read them together.
If you are the provider, long terms mean you fund the work and wait; each thirty days added is a month of payroll carried on your balance sheet. If you are the buyer, longer terms help your cash position but strain smaller suppliers, and an early-payment discount is often cheaper than the goodwill it buys.
"Company shall pay undisputed invoices within thirty (30) days of receipt."
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Definitions and negotiation guidance here are educational business decision support, not legal advice. Consult an attorney about how any clause applies to your own agreement.