First dialog (Marks house):

Q, E, Q/E, Q/E, Q/E, Q, Q

You can skip the dialog by the christmas tree by quitting the game after Joyce have spoken the first word on the phone.

Second dialog (Snowglobe door, before puzzle):

Q, Q

Third dialog (After decorating the christmas tree): (You must tell Joyce to hide, otherwise she gets hurt and will talk loads more in the coming dialogs)

E, Q

Fourth dialog (Basement):

E, Q/E

Fifth dialog (Basement by the elevator):

Q, E

6th dialog (After Cop gets thrown through window):

E

7th dialog ();

You can grab the key and open the door whilst talking to Joyce, you can use this option

Q, Q, Q (more dialogs come after third option)

If you're not so fast with your clicks and don't get the key use this.

Q, Q, E

8th dialog (After you get the gun):

Q, E

9th dialog (After you get the present):

E, Q

Last dialog:

Q (obviously)

Detailed times for each option

(Numbers represent whole seconds)

First dialog:

Q. 25 E: 31

Q. 32 E: 28

Q: 8 E: 8 (Time between dialog choice and door being unlocked)

Q: 8 E: 8 (Time till window is unlocked)

Q: 16 E: 16

Q: 9 E: 12

Q: 8 E: 13

Second dialog:

Q: 10 E: 11

Q: 8 E: 14

Third dialog:

Q: Joyce talks more) E:  (Joyce talks less)

Q: 16 E: 21

Fourth Dialog:

Q: 16 E: 13

Q:  19 E: 19

Fifth dialog :

Q:  18 E: 20

Q: 11 E: 8

6th dialog:

Q: 39 E: 27

7th dialog

Q: 5 E: 5

Q: 19 E: 20

Q: 9 E: 8 (leads to extra dialog though)

8th dialog:

Q: 21 E: 23

Q: More dialogs E: Less dialogs

9th dialog:

Q: 6 E: 5

Q: 26 E: 26