Hi Rich
I am not sure on your age but you look to be a bit older - I am 57 btw and took up guitar at 55. It took months for me to work out various aches and pains - I think it was right around 3 months. But mine were more towards my back rather than my frettting hand.
There are some variables to your situation though:
* Are you playing acoustic or electric - I rarely play acoustic
* How long a period a time are you playing for each session - for me its capped at an hour and then usually some playing at night
* Are you playing lots of barr chords? Those are killers when starting out.
The other aspect, and this is usually an age related matter, do you have any arthritis? If you do this could be a cause. I have arhtitis in my neck and it can be a handful at times and the pain is not localized to the effected area.
Good luck with your studies.
This year the diet is definitely gonna stick!