Question about Schengen visa

Question

I'm a PhD student in the UK, with a history of not finding any visa appointments to go to an international conference. I have an upcoming summer school in Germany, and although I could not find a single appointment for a German visa, I managed to get an appointment for a Lithuania visa (tourism) for the day after tomorrow. I have a few questions:

1. How long do I need to stay in Lithuania? Does it have to be greater than my stay in Germany (which is 7 days)?

2. Does Lithuania have to be my first point of entry? Does it have to be my point of departure? In my visa appointment I need to show return tickets to the UK. So could it be of the following forms?

UK-> Lithuania -> Germany -> UK

or

UK -> Germany -> Lithuania -> UK

Answer 1

You're not really asking the right questions. The reason your travel is taking place is the summer school so Germany is your main destination. Legally speaking, this is unambiguous.

Consequently you are simply not supposed to apply to for a visa from Lithuania and Lithuania should decline to process the visa and refer you to the German consulate instead. There is no point devising some other scheme as you are doing in the comments, the answer will always remain the same.

In practice, the main problem you will face is how to present your trip: If you do not disclose the summer school in Germany, do not provide an invitation letter, etc. you are engaging in deception and it could backfire badly (visa refusal). If you are upfront about it, Lithuania is likely to decline to process your application (not bad but you would be back to square one, without a visa).

Length of stay, etc. only come into play if you try to hide the nature of your trip and try to pretend this is a purely touristic trip, which it is not.