There is no set number of acts in plays.
There are five acts in the play Macbeth.
You are most likely going to find that there are 4 acts in a shake spear play but as far as other countries or states it may be different depending on the culture, such as in japan there are usually...
There are five acts in Shakespeare play as in JULIUS CEASER.
How many acts are in a play depends on the playwright not where the play is performed or written.