I have a hardware rain sensor connected to my RainMachine.  The settings for snoozing after a rain event are limited to "until midnight", "6 hours", "12 hours", "24 hours", "48 hours".  I would suggest allowing this to be user set by the hour (e.g. 32 hours, 16 hours, 19 hours, etc.) as a higher level of granularity would be helpful.  To limit "infinite" choices an upper limit (e.g. 96 hours) would be fine.  At a minimum (e.g. if a lot easier to program) at least offer more choices (e.g. 18 hours, 36 hours, etc.).