*Loan,banking and credit>>>mortgage loan

How long does it take for a mortgage loan to appear on credit report?

I assume you mean a new mortgage, and not a late/missed payment. There are three main credit reporting agencies, and they all do things differently, and it can take different amounts of time. It took between ~2 and ~4 months from closing before mine showed up.

If you've missed a payment, etc. it may never show up. It depends if the lender reports it at all, reports it to each credit agency, or if you worked out a payment plan with the lender, and they choose not to report.

Soon after you close on your loan.
Within 3 payments. When it starts reporting it will report every payment.
I have a mortgage.