At least 2 if not 3 posts per year because… like all marketing, Influencer Marketing is not a switch you flip on or off when it suits. If an influencer has nothing to say about your brand 364 days a year and then suddenly starts singing your praises… would you trust that? It’s best to find ways to work with an influencer year-round to support your branding and have them post frequently on your behalf (all that should be included in the contract).
I strongly recommend using a contract for any sponsorship to protect yourself and your business, such as my Brand-Influencer Contract
SMI* = Social Media Influencers