For anyone who already pays for other things with TRX, buying Telegram Premium adds no new step — same wallet, same TRON confirmation, just a different product at checkout.
Whether spent on Premium or Stars, both a card charge and a payment in TRX settle in about the same time — the comparison is about what's bought, not how fast either method pays for it.
Reusing the same TRX wallet for Premium doesn't require a new address or setup beyond what's already used for other TRX payments.
That depends on the subscription option selected at checkout, not on the payment method — check the option chosen for whether it's one-time or repeating.
If the option isn't set to repeat, yes — a new TRX payment covers the next period when it's needed.