From the day, you create a demo account on MT4 of VT Markets. You have 90 days of valid period.

On the other hand, MT5 has 30 days of valid period, since the last day you login your demo account. In other words, the MT5 login demo account will expire if there is no login activity on it by "Master Password" in 30 days.

If your demo account is expired, you can login your Client Portal to create a new demo account by clicking "Account" > "Demo accounts" and re-apply your application.