Really? It'd take a whole month of grinding just to get one etheric light from vanguard, and one from crucible IF you hit max cap every week. To compare, I get 6 etheric light just by playing iron banner on the last day, and can get 6 in a week in PoE... In comparison to a 4 week continues grind, that's not far at all.
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it would take 2 weeks to get 2 of them, getting the marks doesnt take long
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Earning marks cap at 100 per week per type. If it costs a total of 400 marks for one e-light, it take a month (1 e-light for vanguard and another for crucible, for a total of 2 e-light in one month of grinding). You can hold 200 marks at a time, but that's not earn rate.