How long does it take for a typical star that has no more hydrogen to become a red giant?
It will go until it reaches iron.
A star will fuse hydrogen into helium and then helium into the next element on the periodic table. This will continue until it reaches iron. Iron is too heavy to fuse and it will collect in the core. The time it takes to happen depends on the size of the star, larger and brighter stars burn through their fuel faster than other stars