california just passed new york in total cases, fwiw.
new york has half the population, so they're going to need to get to 820,000 before you're looking at a comparable infection rate. so, that's another 410,000 cases. at 10-15,000 cases/day, we're looking at at least another month.
don't be surprised if it's not much more than a month, though.
i think what it really demonstrates is that the virus must have been circulating in new york quite early on. that's the most probable cause of the time lag.