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What time does it start from as I have 37p on my emergency and can’t find my key

What time does it start from as I have 37p on my emergency and can’t find my key

Please see: https://help.bulb.co.uk/hc/en-us/articles/360019836271-What-happens-if-I-run-out-of-credit-on-a-prepayment-meter-