Time on = time off is just another myth. Let's say that you just did a short three week cycle of 500mg a-50 per day and 4 grams of test a week. According to the above theory in three weeks your ready for another cycle. Now lets go to the other end of the spectrum you just finished a 10 week cycle 250mg of sus 250 per week, do you think that it is really necessary to wait 10 weeks before you can do another cycle.
Time on =time off is one of the goofiest ideas in bodybuilding because everyone uses differant drugs at differant doses in their cycles. You need to go by a number of factors such as blood work, htpa restoration, goals etc. The last criteria should be how long you were off from your last cycle.