Mixing varies depending on the amount of work required. Most times I estimate a song per day and an additional day per revisions across an album. This can vary of course, for example if your album is made up of 40 1-minute songs and the mix tracks are arranged as a single file, I can work much faster. If your album is made up of three 20-minute progressive rock epics with varied dynamics and instrumentation, it’s going to take me longer than week.
Best course of action is to contact me for a quote.