Total opt 12 months and then 17 months is okay, even more then this period is better for the USA really and absolutely

Whoever /wherever the students get the study from USA, they are the best and appropriate to live and work in theUSA.
USA bring or lots of people come to the USA with very low reasons, and those people don't go back or stay in the usa. Also DV lottery is one of the worse things for the USA. USA needs really good professional/educated and hard working people. So I can assert that the students especially the Science students are the property of usa whoever get study from USA. Feel free to talk or discuss with me. Take care and thanks a lot.