We use three campaigns of K2 observations to complete the census of rotation in low-mass members of the benchmark, ~=670Myr old open cluster Praesepe. We measure new rotation periods (Prot) for 220 ~<1.3M_{sun}_ Praesepe members and recovery periods for 97% (793/812) of the stars with a Prot in the literature. Of the 19 stars for which we do not recover a Prot, 17 were not observed by K2. As K2's three Praesepe campaigns took place over the course of 3yr, we test the stability of our measured Prot for stars observed in more than one campaign. We measure Prot consistent to within 10% for >95% of the 331 likely single stars with >=2 high-quality observations; the median difference in Prot is 0.3%, with a standard deviation of 2%. Nearly all of the exceptions are stars with discrepant Prot measurements in Campaign 18, K2's last, which was significantly shorter than the earlier two (~=50 days rather than ~=75 days). This suggests that, despite the evident morphological evolution we observe in the light curves of 38% of the stars, Prot measurements for low-mass stars in Praesepe are stable on timescales of several years. A Prot can therefore be taken to be representative even if measured only once.