No I wouldn’t be able to cruise at all under those wages, because I (and you) live in a first world country. One needs to stop looking at the crew compensation through American or Western European eyes.
NO ONE on the ship is working 84 hours per week; this is illegal. The maximum work hours are stipulated, by international convention, as no more than 72 hours on any 8 day period, no more than 14 hours in any 24 hour period. A MINIMUM of 77 hours rest is mandated every 7 day period.