I've landed a CJ1 at Marina di Campo on Elba, which is 949m, albeit with an uphill slope that helps. I probably had about 100m to spare.
However, it is possible to go much shorter than the manual suggests. The most extreme I have ever seen was as P2 in a CJ that landed at on 21 at Brudel and exited at C - probably about 550m. The PIC had never before attempted such a short runway, so was trying his hardest (possibly too hard) and in a light aircraft. The tower were rather surprised as even the PC12s based there normally exit at D:
