The tense of the verb in the sentence is A. future perfect.
DENOTATION: The direct definition of the word that you find in the dictionary.
CONNOTATION: The emotional suggestions of a word, that is not literal.
He means that it's been a long time since he got relaxed and he is enjoying his break and cherishing it.
Chromatography<span> is used to separate mixtures of substances into their components. All forms of</span>chromatography work<span> on the same principle. </span>