Hi giggsy, welcome to thunder’s.
There is not a definitave answer to your question unfortunately. Growing from 5” up to 6” is certainly possible but it isn’t something that you should expect to happen overnight, in a month, or maybe not even in a year.
There is some hard data you can look at if you follow the PE Data Site link at the bottom of the page just above the donate links. There you will see charted the gains people have made and how long it took.
For now, keep working on the newbie routine for a while and see how you respond to it before moving on to more advanced excercises.
Good luck!
Size