experimental breaks from listening

[Bryony Buck <B.Buck@xxxxxxxxxxxxxx>]

Dear list users,

Does anyone know quite how long a participant should perform trials before 
they are given a break?
I am using musical excerpts approximately 10seconds in length and was 
intending to give a break after every 60th trial (10minutes)

However, I am concerned that this may be too much musical information to 
recieve and process in experimental conditions.
Is there a standard time lapse for when a break should be given?

Thanks in advance
Bryony