Is my FTP set too high?

Here’s a question though… new to indoor training this past fortnight. Did ramp test and it came out at 234. Set about my plan SSB MID VOL 1. Hard, very hard at times, particularly the over under blocks. However, as far as the 234 feeling like it has set my workouts correctly - yep, bingo.

However - am I right in thinking FTP is what I am supposed to be able to hold for an hour? Basically I don’t think I could. Maybe I’m wrong and I could but I honestly don’t think so. ??