Can't get coauthor approval for revisions
I recently received fairly extensive minor revisions for a manuscript and believe I have been able to address them sufficiently. With three days before the deadline (which was initially four weeks long), I asked for a one week extension so my coauthors could have a proper read and approve my revisions.
A one week extension was granted, leaving eight working days before the deadline. I just emailed out my revised manuscript and reviewer responses to my coauthors. One of them has an out of office saying that he's on holiday for the next two weeks and will not be responding to emails. He is not the PI, but can be a bit prickly and did help write one of the sections that I had to fairly heavily revise. I'm under some pressure from the project PI (who I don't work for any more) to get this published ASAP, although I have not spoken to her about this issue.
Assuming he does not respond until I get back should I:
Option a) Submit anyway - I've already had an extension and eight working days was a reasonable timeframe for me to be operating on. When one goes on holiday then one accepts that some wheels will continue to turn.
Option b) Try to get another extension by explaining to the editor that one week actually wasn't enough.