How common is 30 day and 60 day payment timelines for commercial jobs in your area?

I just did a small job 2 weeks ago for an investment group that owns over a dozen appartments in my region and now the project manager is telling me they only pay out 60 days after invoice. I did a small 2 hour job for them in August and they paid in about 1 to 2 weeks...

All my commercial jobs (I do variety of work residential, but we're only 2 guys, so commercial is only repointing due to not enough manpower for new builds) have paid out in less than a week up until now.

Is this normal now for companies to push for 60 day payment terms? It makes me want to avoid commercial from now on... I want to bid on their other property renovations, but I can't afford to just wait 60 days for 10k+ jobs.

I'm way cheaper than the big contractors; I would have thought they'd pay up to maintain a good relationship so they can get their buildings fixed cheap. Baffles me that they'd want to throw this good will away by making me wait 60 days for $2645. They are a massive investment group, certainly not hurting for money...

I usually do my jobs no-deposit and paid on completion; same day pay on residential, payment within 7 days so far on ALL my other commericial work... what kind of deposit % should I be charging to allow me to cover my costs and survive while waiting 60 days for the balance? I have zero experience in charging a deposit; I break some jobs down in payment per wall completed, but I always started each face with no deposit before now.