My name is Dhiren and I work for the Social Media and Community Team at Dell.
There is no default record time set in the windows sound recorder.
The recording may have been interrupted due to some pop up or an application error.
Please try to record another sample and check if the same issue occurs again.
Also,you may find the below mentioned links of some assistance.
The links provide information on how to use the sound recorder and frequently asked questions which also include information on how to set record time.
Link 1. Record audio with Sound Recorder
Link 2. Recording audio in Sound Recorder: frequently asked questions
Hope you find this post useful.
Social Media Responder