The question is phrased badly? We have sex 2-3x per week. That doesn't mean more wouldn't be OK. Her job is demanding enough that sex during the week is the exception not the rule.
For me the ideal would be about 4x per week - but that's age related, when I was younger 1/day would have been fine - or in college 2x/day would have been do-able.
Ah to be young again!