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Good day @Hong1957.
Welcome to TPG Community!
The billing cycle will commence once the account is already active or installed. The installation time frame for our ADSL2+ service is within 10 to 20 working days, while our NBN service is within 2 to 30 working days. You'll receive a notification via Email once it's done.
Let us know if we can provide any further assistance.
Kind regards,