How often should I replace my cleansing foam?

The cleansing product I am currently using is

I bought a large size at Unpa Beauty Shopping

This is Mediflower Grain Facial Cleansing Foam.

My skin type is normal, not sensitive.

I'm really enjoying using the grain facial cleansing foam.

The problem is that since I bought a large quantity, it has been over a year

I became curious because I feel like I will only use this product.

If you have a product with absolutely no side effects on your skin like mine

Is it okay to use only one cleansing foam for several years?

Or I wonder if there is an appropriate replacement cycle.