Each policy will be different, but you can typically insure up to 50% of your income on a monthly basis. The more money you need, the higher your premium tends to be. As a starting point, you should consider what exactly it is you’re looking to protect. Is it just for a mortgage, loan or debt repayment; or would you need to cover your salary as well?
It can be really quick to get quotes based on cover for mortgage payments and income.