Archon Systems C# Software Developer interview questions

After 5 minutes of describing myself, I was asked to solve a problem and one of them had a timer on for 20 minutes. Once the timer is over, the interview was over. It was very intimidating because they want to judge someone with only one coding. Not everyone can work with a clock on. And the funny thing is similar code challenge was done during first phone interview. And they are very prompt to send rejection after the interview.