How many major revisions are allowed when publishing with Elsevier? I submitted my paper to one of the Elsevier journals in the field of molecular biology and evolution, I've got one major revision back; I fixed the comments, and sent it back to the journal.

It is still "under review" for 1.5 months.

What I want to know is 


Is it possible that this review comes out with another major revision?
how many major revisions can I get?
what are usually the time frames for the second round of reviews?
To give this an answer:


Yes, it is posisble that you are again asked to make major revisions.
It's completely up to the editor to decide how many rounds of revisions are appropriate.  There's not a fixed number for all the publisher's journals.
You'll have to ask someone in your field, ideally someone who's published in that journal before.  But it also depends a lot on how speedy the reviewer is, and how long the editor gives them.