How Long Do They Last?

I have had 2 kidney stones since arriving in singapore for work in february. The second one I have now had for 2 weeks. I had to go to hospital last week when the pain was so bad and they gave me various drugs (5 types) to take on onset of further pain.
I am now having an attack once or twice a day (12 hours or so in between), luckily the drugs work.
My question is how long will I have to keep going like this? The stone is 4.5mm in width and was first spotted about an inch down from my kidney in the uretha. This size normally goes through without pain but obviously my uretha can't be too big! I am due to go for another x-ray in 10 days time.
Does anyone know how long this will go on for?
Thank you very much and apologies if this has been asked before but I couldn't find it on the forum.