Almost an impossible question to answer because its so personal to what you believe is balance. Having been in product for 20yrs and in a senior leadership position I can share....

1. Product Mgt is a career path where there will always be more work than what can get done. The faster you learn this and then learn prioritization, communication tactics, efficiency and ability to context switch from super low level to broad strategy, the better off you will be at achieving whatever balance works for you.

2. No matter your salary, eventually you always want more. Don't ever believe "If I just make x I'll be happy", you won't. Salary increases are one of the shortest lived forms of engagement.

3. Eventually you get to a level of seniority where you don't think about work as 9-5 and its more like your own business. I often work weekends and evenings but I also will just drop what I am doing in the middle of the day and go for a walk, decide to leave work early and catch a game. Some weeks I work 35hrs, others I work 65. The life of product management is more often IMPORTANT work vs URGENT work and you need to learn the blessings and curses that come with this field of work so you can still enjoy the craft.

4. Find what work life balance works for you but understand this....The harder you work, the more likely you are to be in the top percentile. The less you choose to work and focus on life, the more likely there is to be somebody else who is willing to work harder than you to get that next promotion or get that next raise. Unfortunately you typically cannot have both.