Talk:Credits/@comment-196.52.39.14-20170716075002/@comment-32865627-20170823035648

I did some more testing:

All times start on my ship as the level loads up and end when I get back on my ship.

All defense missions were exited at 5 waves.

Index Hard: 200,000 credits in 11 minutes = 18181 credits/min

Index Medium: 135,000 credits in 8 minutes = 16875 credits/min

Akkad: 48,500 credits in 5.5 minutes = 8818 credits/min

Seimeni: 25,000 credits in 4 minutes = 6250 credits/min

Hydron: 8,253 credits in 5.5 minutes = 1501 credits/min

Stöfler: 8126 credits in 6.5 minutes = 1250 credits/min

If you can't beat Index Hard in 11 minutes or less, then it is the same or much worse than doing medium.