Yes, a ThinkTrader demo account may expire depending on whether you also hold an eligible live ThinkMarkets account.
I do not have a live ThinkMarkets account
Standard ThinkTrader demo accounts for users without a live account are subject to a 14-day demo period under the current demo policy.
After the applicable demo period, the account may expire or become unavailable.
I have a live ThinkMarkets account
Eligible live-account holders can access a non-expiring ThinkTrader demo account.
This allows live clients to continue practising or testing strategies in a demo environment.
What happens if my demo expires?
If your demo account expires, you may need to complete your account registration to open an additional demo account.