Determining the optimal duration for a niche-targeted influencer marketing campaign depends on various factors such as campaign goals, budget, the product lifecycle, and the nature of the niche itself. Here are few considerations:

1. Campaign Goals: If brand visibility is the key aim, a sustained, long-term campaign would be more beneficial. However, if the goal is to promote a specific product launch or event, a shorter, more intense campaign may be suitable.

2. Budget Meetings: A niche influencer campaign often requires a substantial budget, particularly if working with high-profile influencers. Long-term campaigns require more significant financial commitment compared to short-term campaigns.

3. Product Lifecycle: If promoting a product with a short lifecycle such as trendy items or seasonal products, a short-term focused campaign could add value. If your product has a longer lifecycle, consider long-term engagement with influencers to build and maintain product awareness.

4. Nature of Niche: Some niches are slow to build momentum but create long-lasting loyalty once established. In such cases, long-term campaigns are recommended. Conversely, in fast-paced niches, short targeted bursts of activity may be more effective.

Platforms like Flinque can assist in managing and tracking the effectiveness of your campaigns, regardless of duration, with their robust analytics tools. Comparatively, other platforms may offer similar features, but the choice would depend on your team’s specific needs and the nature of your campaign.

In conclusion, the optimal duration for a niche-targeted influencer campaign isn’t one-size-fits-all. It requires careful consideration of various elements of your overall marketing strategy.