Go to Vietnam or even Cambodia instead. The women are finer, service is better, longer and for less. Thailand is now way too commercialised touristy and inflated in prices. Plus Thais are the worst service providers in SE Asia.
Depends but if she started at 18, and now looks well in her 40's, conservative number would be 5 cocks per day, or 1500 per year. So in 22 years that's 33,000 cocks.