I do IF which is 16 hour fasts and I train twice a week after 14 hours fasting without ill effect. Can't say for sure what a 24 hour fast would do but I am usually fairly hungry by hour 16. The obvious way to go would be have your last meal at 8pm then fast until 8pm the following evening. I assume this is all part of The Plan (trademark)?
I have read before that 24 hour fasting can be quite healthy. Martin Berkham has also alluded to this at some point I'm sure.