Getting a medical degree in United States is the long road, first you’ll have to earn bachelors degree for 4 years in medical. Then another 4 years for medical school and finally you will have to complete residency program for specialized training that is usually for 3 years. Sometimes this training is followed by fellowship program that can last up-to 7 years. So you are talking about minimum 11 years and maximum 15 years.
The cost associated is also very high, very easily you might have to spend up-to 50 Lakh Pakistani Rs. per year just for tution fee. Residence, insurance, transportation cost is extra
Most Pakistani doctors do MBBS in Pakistan and get a doctorate degree, after taking degree they give USMLE papers in United States (United States medical licensing examination) which means study will be equivalent to a doctor in United States and you can work in United States as a doctor after clearing USMLE papers.