after how may years i can resell my property without paying tax

If you have inherited the property, you can resell it immediately without paying CGT.
If you have used the property as your primary residence for more than 4 years (for houses and built-up properties) or 6 years (for plots), you can resell it immediately without paying CGT.
If you have sold the property due to unforeseen circumstances, such as a medical emergency or a job transfer, you may be eligible for a tax exemption.
If you are unsure whether or not you will be liable to pay CGT when you resell your property, it is always best to consult with a tax advisor.

Here are some tips to avoid paying CGT on your property in Pakistan:

Hold on to your property for at least 6 years (for plots) or 4 years (for houses and built-up properties) before reselling it.
Use the property as your primary residence for as long as possible.
If you have to sell the property before the holding period is over, try to claim a tax exemption.
Consult with a tax advisor to get personalized advice.