If you call them they will say 10 weeks from the day your doccuments was received. You should be able to upgrade your application from 6 weeks at a cost though and free over 10 weeks if your travelling in 2 weeks or less.
I spoke to an adviser on the chat this morning that said any one who has been waiting longer then 10 weeks should be eligible to escalate there application and to speak to the help line to do that. 3 advisers later and still a lot of confusion no one can quite work out how to do that on the system 😂