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Which of these is grammatically correct?

1. a) He has been working under my direct supervision since the last two years

1. b) He has been working under my direct supervision for the last two years

2. a) He has not met her since a very long time

2. b) He has not met her in a very long time

Which of the above are correct?
Are all of them correct? My friend says 1.b and 2.b are correct, but I am not sure. Or is this an American English and British English thing? (He mostly goes by American English)

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1b) and 2b) are correct.

You could correct 1a) as:

He has been working under my direct supervision since two years ago.

and 2a):

He has not met her since long ago.

Since as used here points to a specific time, not a time span as in your examples.
See the definition since senses 4 and 5.

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If you want common usage following proper grammar:

Since is usually/most commonly/should be used as a conjunction, in this meaning, should be followed with a clause (sentence). There are exceptions such as since yesterday since today which are common phrases almost accepted as proper English.

He has been working under my direct supervision since he first started

for/in is a preposition, in this meaning, and is only followed by a noun, to complete a prepositional phrase, like in 1.a) and 2.b)

The usage precise difference between the prepositions for and in, is difficult to pinpoint, you could say usage depends on US/British/Australian English, and certain phrases may tend to use one over the other.

Therefore if you take a grammar test, of correct English, and there is only one correct answer, 1b and 2b are correct. Local English, slang English, poor english, instagram english may accept 1a 2a.

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