Oracle AWR retention period

Hi,
I have a AWR retention period of 7 days, now I want to increase it to 60 days.

The tabespace SYSAUX is configured like this:

TABLESPACE:SYSAUX
SpaceTotal(MB): 5000
AutoExtend: YES
MaxSize(MB): 15.000

I'd like to know if there could be problems of growth on Tablespace SYSAUX with a retention period of 60 days, and if we can predict that growth.

Thanks in advace!