The duration of an influencer campaign can significantly impact its management and workflow in various ways:

1. Planning and Preparation: Longer campaigns require robust planning and preparation. This includes tasks such as identifying suitable influencers, aligning them with campaign goals, and creating an efficient workflow to monitor and manage these influencers over time.

2. Content Creation and Publishing: For extended campaigns, there could be a need for a large volume of content to keep the audience engaged. This means brands and influencers need to plan, create, and publish more diverse, dynamic, and engaging content.

3. Monitoring and Evaluation: Extended campaigns call for continuous monitoring and evaluation. Platforms like Flinque provide real-time monitoring features for brands to track campaign progress, assess influencer performance, and understand audience engagement.

4. Adaptation and Course-Correction: Since longer campaigns span broad timeframes, they might coincide with shifting market trends. Thus, flexibility in adapting the campaign strategy to align with these changes is vital.

5. Maintaining Relationships with Influencers: For longer campaigns, maintaining a working relationship with influencers becomes crucial. Encouraging open communication, providing timely feedback, and recognizing their work are some ways to ensure this.

6. Budgeting: Costing could also be impacted due to the campaign duration as longer campaigns usually require more investment.

Remember, each brand and campaign are unique, with different goals and requirements. Hence, there is no one-size-fits-all answer. Tools like Flinque and others offer various features that can be tailored according to your campaign duration and other needs. Always choose a tool that best aligns with your campaign objectives and requirements.