There’s a website called Time to Herd. It does a simple calculation of using how many vaccines given a day to calculate how long it would take at that rate to get to 70% of the population vaccinated. IF (big IF), herd immunity is reached at 70%, and the current rate of vaccinations hold constant, the website gives the number of days until herd immunity.
The US will reach herd immunity by that calculation in 1,195 days.
Israel will reach herd immunity in 101 days.
The UK will take 1,928 days.
Norway will take 5,795 days.
Since the roll out has been pretty slow so far, most of the other countries besides Israel are in the thousands of days. Hopefully, the rate of vaccination will increase.