You can create a font quickly, sure. To do a good job will take quite a bit longer. Helvetica took a year. For the semi-bold variant in one size. The thin,

You can create a font quickly, sure. To do a good job will take quite a bit longer. Helvetica took a year. For the semi-bold variant in one size. The thin, bold, and italic variants took about a year each. Helvetica Neue has fifty-one variants, that's not something you're going to do quickly.