Test-P injections are made as a rule every day or every other day. Steroid cycle lasts 6-8 weeks. Testosterone enanthate and cypionate cycles shall be run not less than for 10 weeks. On shorter cycles long esters will not be able to expose their full potential. For enanthate and cypionate is one injection every 5-7 days is enough. However, some athletes prefer more frequent injections in order to provide more even hormone level in blood and to avoid dramatic fluctuations. And don`t forget, that steroid aromatizes very easily to estradiol. Independent on the compound you use, keep your estradiol under control by taking aromatase inhibitors (anastrozole preferably). Antiestrogens (SERMs) are in this context not recommended, because they will reduce the cycle efficiency.
While athletes and some researchers believe that testosterone produces a mass improvement in performance and endurance, others believe that it cannot produce overnight effects. It cannot give a jolt of energy to sportspersons in order to improve their performance, since testosterone acts over time to build muscle and strength in the athlete. But even then, there has to be a considerable amount of effort (in terms of exercise) on the part of the athlete. Simply taking testosterone without any exercise or a suitable diet will only do more harm than good.
The partition coefficient of the ester in question is important because is effects how long the drug itself stays in the system. If the testosterone transfers too quickly from the oil to the blood, the result is a sudden spike in testosterone which then rapidly drops once the dose has been used up. In the example of free testosterone injected into the muscle from a water suspension (as in Aquiviron, mentioned above), the testosterone is essentially immediately available to the bloodstream due to its low partition coefficient, and thus there is an immediate spike of testosterone which is used up quickly in the body.