SINOATRIAL EXIT BLOCK. FIRST, SECOND (type I, type II) THIRD DEGREE. ECG criteria. Wenckebach. 

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thanks for your question, this is occurs due to Wenckenbach conduction, the key moment is that we maximal gain usually occurs in the second complexes, further for better understanding open the video in 5:14, conduction throught the T cells in 1 complexes is 1 square, in the 2 complexes is becomes three time bigger - 3 squares (maximal gain from 1 square to 3 square or 300% from previous that prolongs P-P inteval maximally) in 3 complex is 4 square that is gain only 75 % of previous. As a result P-P interval with maximal gain inside is maximal. Near to the pause gain becomes smaller and P-P too. I understood only when i draw it in the paper with squares maybe it can helps you too

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Yes, in case of 2nd degree type 1 pause duration is less than 2PP, in case of 2nd degree type 2 pause is equal 2 PP

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Thank you for your attention, i used calculation according paper speed 50mm/sec, in this case, 12 large boxes is 1.2 sec