I would go for the lower end of Jake's range - or even less than that. Doing 150 lines in half an hour (the upper end of the range) might be possible but I don't think anyone would sustain that rate for very long.

(Assuming you make no effort to automate any of it) where there is a straighforward one-to-one correspondence you would still have to type in the replacement code. Where there isn't (for example Wordbasic Sort) you would get slowed down a lot. And I don't know what you would do with statements like DisableAutoMacros where the only way to do it is via the WordBasic method from VBA.