Invitation letter

Guten Tag, i am new here and i want to know how long does invitation letter from Germany can be release? Hoping for a reply from anyone who knows about this matter. Danke Schön

What do you mean by " how long does invitation letter from Germany can be release"?
In case you mean the duration of being invited: You usually get a 3 - 12 months visa, depending oin the reason for being invited.

Danke, beppi i just wanna know if he is telling the truth about his application for that matter coz he said that the embassy told him that he will get a reply maximum of two months. He applied for a tourist invitation letter

A tourist visa is usually one month duration, but can be up to 89 days.