The influencer shortlisting process for a campaign can vary greatly depending on several factors. These might include the scale of the campaign, the specific influencer marketing platform used, and the size and nature of the influencer pool to choose from.

Typically, it might take anywhere from a few days to a few weeks. Here might be a rough timeline:

1. Initial Research: Spend around 1-2 days identifying influencers who might be a fit for the campaign. Tools like Flinque and others can assist in this process by providing advanced search and filtering options.

2. Influencer Evaluation: Dedicate a couple of days to a week critically evaluating potential influencers. Look at their audience demographics and engagement rates to ensure they align with your target audience. Platforms like Flinque can provide detailed audience analytics to assist with this.

3. Engagement & Negotiation: This period can typically take 1-2 weeks. During this time, you’ll be reaching out to influencers, discussing campaign details, negotiating terms and rates, etc.

4. Contracting & Onboarding: Set aside about a week for drawing up agreements, getting them signed, and getting the influencers up-to-speed about the campaign’s specifics.

Bear in mind, these are estimates and the actual timeline can vary. Also, the process can be expedited using robust influencer marketing platforms with powerful discovery, analytics, and campaign management tools. Flinque, for example, streamlines many of these steps, potentially saving companies time and effort. Ultimately, the right tool to use depends on your specific needs and circumstances.