I did two full-time jobs for a month as part of changing jobs fifteen years ago and it’s exceedingly intense but otherwise was fine; eighteen hour waking days leave a lot of boredom time, no matter how many hobbies you have. Employers don’t like this because that’s a lot of work they could have persuaded an employee to provide as unpaid overtime labor instead; much this outrage is simple jealousy. If you’re doing the job to the specifications requested at a sufficient level to remain employed, then they have no basis to cry outrage. Employment is just as monogamous as marriages are: sometimes, not always.
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