おかげ様で

[Aoyama]

Is that use : おかげ様 まで ３０年　(thank you for your support for 30 years/thanks to you we have been in business for 30 years) usual (the use of まで) or a mistake ?

 

[_forumuser_]

Is that use : おかげ様 まで ３０年　(thank you for your support for 30 years/thanks to you we have been in business for 30 years) usual (the use of まで) or a mistake ?

I guess it's just a typo.