To answer this question, you need to compare expected annual income and expenses. The more your expenses exceed your income, the faster your savings will be depleted. As a basic rule, you can divide your assets by your financial needs per year: For example, if you have assets of 100,000 Swiss francs and spend 10,000 francs of this every year, the assets will be used up in about 10 years. The money will of course last longer if you achieve a positive return on your assets through good investments.
In general, it is worth planning your income and expenditure situation in detail with a specialist, even for the time after retirement. This will help you avoid nasty surprises.