Number of risks in the project

Hello to all,

I would like to ask you what is your opinion about the number of risks assigned into the project with 1000 activities. I do not want overload my schedule by huge number of the risks which will not have impact on the plan. Is here any recommended number of risks, which would sufficiently cover all potential risk in the project? Is it for example 50 or does it depends on size of the project?

Thank you in advance
David