Her decision to oppose the July 25 recess date means a vote will be triggered, either tonight or later in the week, depending on whether the motion to approve it is brought forward before 10pm.
Labour, the Liberal Democrats and the SNP were all understood to be discussing how to instruct their MPs to vote, but all want the new PM to come to parliament.
Jeremy Corbyn is reserving the right to trigger an immediate no confidence vote in the government once Johnson or Hunt take office.
Wollaston attempted to pin the blame on the Tories in a bid to win over MPs who are concerned about delaying summer recess.
“The Tory party could themselves say they are going to truncate the period to two weeks, particularly if (Johnson) is not prepared to do any media, what’s the point?
“At a time of national crisis we were told by the EU not to waste this extension.
“We’re wasting a whole month of it with this self indulgent psychodrama in the Tory party and less than a quarter of 1% of the population are going to decide the next prime minister anyway.
“So to the rest of us it looks ridiculous.”
According to the Sun, the new Tory leader will be announced on Tuesday July 23 after postal voting of party members ends on Monday July 22.
They will then take over from Theresa May on the afternoon of Wednesday July 24 – crucially after the last PMQs of the term, meaning they will only have to face one day of the Commons sitting on Thursday July 25 before the six-week break.