Quick question - is it a best practice to add a footer link on each page of a website that points back to your home page, with the anchor text being your official brand name?

Hello all -- just looking for those who have implemented site-wide 301 redirects due to a domain change. I am about 2 weeks into mine and am seeing minimum 5, maximum 21 spot drops in many of my targeted terms. My pages have strong GPR, with most being 3 or higher. Anyone out there been able to track a ballpark of when rank will return? The 301 redirects were implemented correctly, with 1 to 1 setups in most cases. Google has updated the listings with the new domain name, but I'm taking a huge rank hit. Any experience on how long I can expect (I know it's different for every situation) would be great! Thanks.