Actually:
Once a bill has completed all the parliamentary stages in both Houses, it is ready to receive royal assent. This is when the Queen formally agrees to make the bill into an Act of Parliament (law).
There is no set time period between the conclusion of consideration of amendments/ping pong and royal assent.
What happens at royal assent?
When royal assent has been given, an announcement is made in both Houses – by the Lord Speaker in the Lords and the Speaker in the Commons.
At prorogation (the formal end to a parliamentary session), Black Rod interrupts the proceedings of the Commons and summons MPs to the Lords chamber to hear the Lords commissioners announce royal assent for the bills passed towards the end of the session which had not received royal assent earlier in the year.
The reigning monarch has always needed to give his or her royal assent to parliamentary Bills in order to make them into law.
In modern times, the monarch acts on the advice of the government and the royal assent is considered a formality.
The last time that it was refused was in 1707, when Queen Anne vetoed a Bill on the Scottish Militia on the advice of ministers.
It could still be refused in which case the Bill does not become an Act (Law).
Very good. Thank you for the correction.
But do you really think Her Majesty would ever deviate from the tradition?