Since I don't like to sleep with anyone, I can only answer for short time, WITH massage and they are generally really good massages 400-500k rupees 24-30usd = 20-25 eur
When I do like someone enough to spend a day with them and I'm staying at a resort, I find out what day they're free and invite them to stay the day or full night (very rare) at the same rate, it's not like we're fucking the whole time and they get a day at a resort being treated really well, swimming photos, and it's not so commercial like Thailand where they have to get back to their next customer. But this isn't something I think about until I've been with them a few times and I know the chemistry between us, as do they.