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Depends how well insulated your tank is. If it well insulated you may as well leave it on all off-peak times, as very little energy is going to heat up your airing cupboard. If it isn’t so well insulated you probably don’t want a hot airing cupboard, in summer at least, and it’s best to heat the water as closes as you’re going to use it as possible. You need to experiment a little. I’d initially try setting it for an hour each afternoon and seeing how you go. Remember also that there’s no point heating water hotter than you need to. If you need to dilute hot water with cold you’re pouring money down the drain.