I have been on Sus 250 @500mg week for approx 9 weeks now.

What is the longest period for a cycle that I will continue to see gains ?

I was going to do 12 weeks but have now decided to continue to 16 weeks - could I go longer ?

Also, should I up my mg/week to say 750mg/week to get extra gains before I finish my cycle,

OR

Stick with 500mg/week of Sus and stack it with something else for the last 4 or 6 weeks to to get the most out of this current cycle ?

Any opinions would be great thanks.