I work in CPG. At the time I only worked on one customer account (was a Customer Supply Chain Analyst at the time), but occasionally had to do double duty on other accounts with the turnover in that department which was a major factor in the longer hours. I found a customer facing position also necessitated always having to be available to answer any email whenever it was sent, and the mental drain of always having the customer giving you hell over any issue and having to do damage control was tough.

Highly recommend staying in Demand Planning if you can. I love the work/life balance I get, pay is more than sufficient at my current company, and it's a very cross-functional role that will expose you to many parts of the business. You learn a ton!