This depends on the size of your organisation and the purpose of your policies.
This is what you should aim to have for a typical organisation with less that 50 staff:-

For larger organisations, the numbers might go up by say 20% due to the complexities of dealing with stricter and more centralised systems.

Minimise the number of policies

1. Focus on key policies and get them right
2. A common sense approach to safety will cover most unusual situations
3. It is better to invest time in developing staff and instilling common sense
4. Do not overwhelm staff with paperwork to cover every eventuality.