Hello, Akash.
Indeed now the exam has a scheduled built-in break of 10 minutes, which is extra time with respect to the 4 hours allowed for the exam. Once you submit the first part of the exam (I strongly recommend to review them before submission, because after that you won't be able to access them anymore!) you will be given the option to start the break or proceed to the second part of the exam. The break is optional, you can skip it, but this won't give you access to the first part of the questions anyway.
Please, notice that the first and the second part of the exam are entirely based on the number of questions, while the timing is up to you: whenever you submit the first time, the count-down timer pauses until you begin the second part. For example, say you complete the first part in 1.5 hour, you will get 2.5 hours for the second part.
I would recommend to read some posts from the lessons learned forum, where you would find additional details on the experience many had with the new exam, both online and onsite.
Hope this helps,
Gabriella