Not necessarily you get a rare every 60 rolls, for example i got once 3 rares in 130 rolls. Exist a chance to get a rare out of an early rng lucky roll, you do not get them only if you hit the hidden counter. That's why calculating the total rolls done by calculating the number of rares is never a good way to do the calculations and is also the reason why a ton of people in the past used to say that at 1300 still had not gained a super rare, the reason was, simply they were not at 1300, but just had a ton of early rng random pulls.