While we don't know, but I would not be surprised if the production of missiles like the PL-15 could reach around the ~1000 a month at max throughput (three 8 hour shifts a day).
While regular output (1 shift likely not even running at 100%) would likely be less than 1/3 of the 1000.
That said, the PL-15 might have stopped, but the new PL-16 or whatever its successor is, can probably do the same.
Or in short, whatever current non wartime production, for China atleast, ramping it up to probably 3x or way more in a short time frame (a month maybe) should not be hard.