There is intermittent hormone therapy - there is some science to the idea that stopping and starting delays the point at which the cancer becomes castrate resistant. However, to be suitable for IHT, the generally accepted baseline is at least 2 years of stable PSA below 0.2 (if the prostate has been removed already) or below 1.0 if there is still a prostate. As CJ says, flooding is really untested and didn't go well for Si.
Two examples on here are George_H and TopGun