The deadline is Edit -
Thursday 29th.. to form a government.
https://www.channel4.com/news/factcheck/could-todays-queens-speech-bring-down-theresa-may
As far as I know, if Theresa May did fail to form a government, the baton would pass to Corbyn. But he too would need a majority, so the chances of him getting a Queens Speech passed are virtually zero.
Most likely is that Theresa May's Queen Speech will pass with some ease. Her government will continue on as normal for a while. Until:
- Labour can arrange a coalition to ambush a tired Conservative part with a vote of no confidence. A simple majority is required. The Tories would then have 14 days to pass a motion of confidence (again, a simple majority is required) otherwise another General Election is called.
- The Tories start losing motions. This could especially happen on any controversial subjects, like Brexit. In which case they will be under pressure to call a General Election as it becomes clear that they no longer have power in commons.
But we could be in for a long wait.