Yup it's here. We have introduced Timed Challenges in CodeEval. This allows employers to specify a time duration for each challenge after which the candidate will not be allowed to submit solutions. In order to make a challenge a timed challenge, merely click the checkbox and specify the number of minutes the challenge should last.
Once this is saved, candidates will be prompted to complete the challenge in one sitting before they view it.
After that, the candidates can view a decrementing counter which tells them how much time they have left.