I find players with same weapon as me and since we attack at same time , they hit me first and they do not have attack speed amulet .
My dilema is , does mastery increase attack speed ?

Attacking at same time (in this case you mean using the power attack at the exact same time) is nearly impossible to happen, even if it's a slight difference of 0.001 sec. Also, with the game being played via internet, lag is an issue and can impact the outcome. (Not even taking into account the influence of yellow powder, or different ranks of frenzy, or if frenzy is even enabled.)
To answer question: no mastery doesn't affect attack speed, only damage.)

I am a berseker and we both have frenzy buff , and this happened to me thousand times we attack at same time and i get hit first . So there must be somethink .

also you can get amulets to increase attack speed, also healers can buff speed too

he originally posted he was sure they didn't have attack speed amulet, and then you went on to repeat one of the things I mentioned.
Go to bed my son

how would he know they didnt have the ammy tho

he just knows man

The question was: "does mastery increase attack speed?" - the answer is no it does not.

Thnx .
And to do not open another treath , i woud like to know if i craft an amulet 7 days one , and i whear it like 14 hours per day time i play , the other time i have it unequiped , it will be reduced from those 7 days ?

No. Once an Amulet was equipped it can not be unequipped. No mater how much u play, 14 hours or 5 hours a day if it`s 7-days amulet it will last exactly 1 week.