My answer:

27 seconds.

Because:

Because one person can no longer overtake another if the other has already overtaken him, Neeraj can only be second place during the lead of two consecutive people. Why two? Let's assume he started at position 2. For 13 seconds, no overtakings take place. Then, former position 3 (Harsh) overtakes Neeraj and Ashish, while Ashish falls behind you. Neeraj is now still position 2 for the next period (14 seconds). But now Neeraj can't stay on position 2 because he cannot overtake Harsh anymore, while Devesh overtakes them both. He will never get to position 2 any more. The longest period of two consecutive leaders is 27 seconds (Ashish and Harsh), and that will be my answer.

My answer:

27 seconds.

Because:

Because one person can no longer overtake another if the other has already overtaken him, Neeraj can only be second place during the lead of two consecutive people. Why two? Let's assume he started at position 2. For 13 seconds, no overtakings take place. Then, former position 3 (Harsh) overtakes Neeraj and Ashish, while Ashish falls behind you. Neeraj is now still position 2 for the next period (14 seconds). But now Neeraj can't stay on position 2 because he cannot overtake Harsh anymore, while Devesh overtakes them both. He will never get to position 2 any more. The longest period of two consecutive leaders is 27 seconds (Ashish and Harsh), and that will be my answer.

My answer:

14 seconds.

Because:

Because one person can no longer overtake another if the other has already overtaken him, Neeraj can only be second place during the lead of one single person. The longest that one person was in the lead was 14 seconds, and that will be my answer.

My answer:

27 seconds.

Because:

Because one person can no longer overtake another if the other has already overtaken him, Neeraj can only be second place during the lead of two consecutive people. Why two? Let's assume he started at position 2. For 13 seconds, no overtakings take place. Then, former position 3 (Harsh) overtakes Neeraj and Ashish, while Ashish falls behind you. Neeraj is now still position 2 for the next period (14 seconds). But now Neeraj can't stay on position 2 because he cannot overtake Harsh anymore, while Devesh overtakes them both. He will never get to position 2 any more. The longest period of two consecutive leaders is 27 seconds (Ashish and Harsh), and that will be my answer.