English Sentence
Whenever you find yourself on the side of the majority, it is time to pause and reflect.
Other sentences in the corpus lead me to believe that siempre que + subjunctive means “as long as”. 
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According to the Wiktionary page for siempre que it has both of those meanings (and the examples for each of those meanings use the subjunctive).
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I think that in the case of whenever, the choice of mode follows the same rule as with cuando, depending on whether it’s forward-referencing or not.
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