My first interview out of college in 1999-2000 was something like this. A full day interview about designing the components of a TCP-IP stack interspersed with some personality/behaviour interviews. End of the day, you either knew you had an offer or you didn't. I had an offer. I would kill for such an interview experience now.

The last interview I attended stretched across a month or may be more. Glad I got the job but boy what a nightmare.

If someone told me today that I would finish all rounds of interviews in one day and this became a standard, even figuring out for hedging I would take a week off, schedule 5 interviews and be done.

Even fundraising for a startup doesn't take 2 months these days, whereas an interview will. That should tell you how broken the process is.