This train stopped at manikpur jn for good 15 minutes and food vendors were all around the place selling samosas, omlets, puri sabji, chai etc as if it's a regular stoppage and they were prepared for it. However, the time table doesn't mention this stoppage.
I asked one samosa guy about the halt time here. He said 20 minutes.
Btw samosas were really good and really hot, so good that I had 5 of them. Recommended.