A mathematical mistake in Romeo & Juliet?

Well well, only after the 100th time reading Shakespeare's Romeo & Juliet I start to do my mathematics. Here we go : .............................................................................................................................................. The tragic story of Romeo and Juliet took place from Sunday to Thursday. Romeo and Juliet met each other at the party on Sunday night. They married Monday morning. Around noon time Romeo kills Tybalt. Tuesday, Juliet goes to the friar to ask for help. Tuesday evening, Juliet drinks the potion. Wednesday is the day of the discovery of Juliet's fake death, and in the evening, Romeo commits suicide when he believes his wife to be gone. Thursday, Romeo and Juliet dies. .............................................................................................................................................. But think about this: if Juliet takes the potion on Tuesday night, and the potion lasts 42 hours, she will not wake up until Thursday afternoon (in the play that's when Romeo and Juliet's funeral takes place). Therefore, in Act 5, when Friar Laurence says that Juliet will wake up in 3 hours, it is still Wednesday night. You see? It doesn't add up!! .............................................................................................................................................. Can someone, a fellow nerd or a fellow love-sick patient clear this up for me?