PS:
3 weeks is not impossible, but there are multiple parties involved that could include agents, escrow, title, insurance, termite company, appraiser, inspector, your employer, IRS, loan underwriter, lender funder, current landlord, etc.
It all needs to come together.

They all may try to accommodate, but they won’t be rushed because of your commitments. Underwriters have a tough job to do and it’s just another file to them. (Special favors can be requested)

The stark reality is that many, many people do not qualify for loans, regardless of credit score, equity, income, cash, assets etc.

In many cases it is easier for someone with bad credit and 3.5% down to qualify for an FHA loan than someone with
an 800 credit score who makes $200,000 a year and has 50% to put down.
It’s ALL about qualifying for the program, and not only based on income/assets/equity.