I just had a make this app in 2 hours. Usually I like to think about a design for at least half a day before coding. So I did this, evolved my design on the way got it 80% finished, then was criticised for not including tests. Seriously, who even has to produce something other than a two line bug fix with a 2 hour deadline? As I get more experienced, I realise thoroughness is way more important than raw speed. Over the long term it saves a lot of time.

You're not the target of Fizzbuzz though clearly. But with that in mind you should be able to finish it so quickly that it would take less time than a standard question about your last job.

>FizzBuzz irritates me because they haven't gone to the trouble of thinking something else.

Because they don't have to. It's simple and easy to use filter that will remove a lot of noise. It's not perfect, some people will memorize a solution to it but simple changes to the question solve that. But it does really work.

I think having to sit on the other side of the table for a while gave me a lot more respect for the pain that is being an interviewer.

>Another thing I was given was "make me something interesting in 30min" or "try to solve this problem in 2 hours"

Which are totally different and often useless beasts though done right really helpful but honestly I was never willing to invest 2 hours into a single interview nor make someone sit in a room for 2 hours while I went back to work.