How long does it take to find a new job?
The answer depends on many variables. Here are just a few.
First, how long has it been since you last truly looked for a job? Many people haven't actively looked for a job in more than a decade. They might have changed jobs a few times in that span but the jobs found them. If it has been more than a few years your skills and experience are rusty and the whole process has changed. Add a few months to your timeline because you will be lost for a while.
Second, what kind of job do you seek? If you want an executive position that advances your career, or at least doesn't go backwards, it will likely take 3-4 months from the first interview, not counting the time it takes to find and land the first interview. This is mainly due to the employer's interview process, which will likely go 4-5 rounds of interviews then a few weeks to a month for negotiations, background checks and scheduling the start date.
Third, how skilled are you at interviewing versus the likely competition? Can you close for commitments at each stage? Do you follow up persistently or do you sit and wait? While you wait the clock keeps ticking. A month can go by before you know it.
The real answer...much longer than you think.