When does my Luckgram Premium renew or expire? Where is the expiration date?

In development. Luckgram Premium does not exist yet. For Telegram Premium, see your App Store or Google Play subscriptions.

If you subscribed in the App Store or Google Play, the store’s subscriptions list shows it:

• iPhone and iPad: in the device’s Settings, tap your name, then Subscriptions, then the Luckgram subscription. A red expiration message means it will not renew.
• Android: open subscriptions on Google Play. A subscription that will not renew keeps working until its current period ends.

Sources: Evidence ledger