The other problem for the Remainers is that Europe isn't exactly falling over itself to create the long lead time they need for their cunning second referendum plan, in fact, the Europeans seem incredibly fed up with the whole business. It looks increasingly as though May's deal is all the Remainers have and their only achievable objective now is to avoid a no deal Brexit.
The silence speaks volumes.
I'd guess in that situation a longer extension would be necessary if the EU wanted to keep control of the UK.
Don't count on Macron to help us with his veto; he's just posturing.