On maple, I apply tung oil finish one day apart for applications, until I get what I call an orange peel finish...little bumps. I cut the finish back until I get to the wood again, and start over. So in total, 12 to 14 applications of oil. Each app is just enough to wet the wood - not enough to visibly accumulate.
For walnut, filling the pores is required for a best finish. After sealing the walnut and letting it cure/dry, I sand the wood with oil and 320 grit paper, until a mud is raised, then move on to another sport and repeat until the until stock is 'mudded'. Once it dries, and it will take a couple of days, I sand the finish right back down to the wood again. It may be necessary to repeat in some area that had particularly open grain. Once the grain is completely filled, I apply light coats of oil, just wetting the wood, until I
'm happy with the finish - usually about six coats.