Well, it depends on your age of retirement.
See, as an entrepreneur, you may be working for more years than a typical corporate employee and hence your retirement is more likely to be much later.
So, you may want to cover yourself for a longer duration.
Here's something you should keep in mind that will help you understand this:
Term insurance is like a replacement of your income when you are no more.
Let's understand with an example.
Say, you plan to work till you are 70 and think your family will be depending on your income till then.
In that case, you should stay covered till 70 years of age so that if you pass away during the policy duration, your policy money will help your family avert any financial crisis.
But, if you think by then, you will have enough corpus, your spouse may have their own wealth accumulated and your children may be financially independent, you don’t need to cover yourself for a longer duration.
Remember, your policy duration should be decided on the basis of your and your family’s requirements; there’s no one-size-fits-all approach that works here.