How many years I have to wait to changr my saline breast implant?

Not time dependent. Breast implants don't have to be replaced based on time. We know that the deflation rate for saline implants is about 2-4%/year, so if you have 2 implants (most people do!) your yearly chance of deflation is 4-8%. Theoretically, that means that an average patient will have a deflation every 12-25 years, but very few people are average. Implants only need replacement for problems.
Your call. The average is 10-15 including all, ie changes for leaks + those done for aesthetic reasons.
Debated time. You may also want to review the fda position statement: http://www.Fda.Gov/medicaldevices/productsandmedicalprocedures/implantsandprosthetics/breastimplants/default.Htm.
Gather more info . You may also want to review the fda position statement: http://www.Fda.Gov/medicaldevices/productsandmedicalprocedures/implantsandprosthetics/breastimplants/default.Htm.
Get more info: You may also want to read the fda position statement: http://www.Fda.Gov/medicaldevices/productsandmedicalprocedures/implantsandprosthetics/breastimplants/default.Htm.
See FDA position. You may also want to review the fda position statement: http://www.Fda.Gov/medicaldevices/productsandmedicalprocedures/implantsandprosthetics/breastimplants/default.Htm.
Controversial . While the formation of a biofilm is a well established phenomena, the causation of auto immune disease to implants has been controversial and several large studies by impartial reputable academic institutions have failed to demonstrate link. Biofulms have been associated with capsular contracture and not autoimmune disease to the best of my knowledge.
10 years on average. Saline implants should be changed out every 10 years or when partial deflation is noted (usually seen as rippling and smaller size). Once the valve is incompentent, mold contamination of the saline is common and fibromyalgia and diseases that look like lupus and MS can occur. See www.Thenakedtruthaboutbreastimplants.Com.
It depends. Breast implants (both saline and silicone) are not life time devices and should be expected to require replacement at some time. Typically after 12-15+ years, implant "failure" may occur. There is however, no specific timeline and replacement is not indicated unless or until there are signs or symptoms (deformity, loss of volume or shape, pain, hardness, asymmetry, drooping, or rippling).
At least 6 months. You should wait at least six months before exchanging breast implants. Mos recommend saline implant exchange every ten years as they may have micro leaks. If you are not having problems, they probably don't need to be exchanged.
You dont. You don't have to wait any specific time period to change out your implants. You should give yourself sufficient time to heal and make a decision after surgery, but if has been a few months and you would like to switch them out for whatever reason then go ahead.