How far is too far?

30 minutes.

If you choose a venue further than that, be prepared that not all your guests will attend the ceremony.

Not sure if your guests are big drinkers or not... but I don't think the distance between the ceremony and reception is as big of a deal as the distance between the hotel and the reception. I don't mind driving far (but I wouldn't do more than 35/40 min), but do think it would be ideal to have the hotel close to the reception venue so if they are drinking they can uber back and forth. If this is the case, I also think it is ideal to give folks an extra 30 minutes or so in case they want to drop their cars back off at the hotel and uber to the reception (even if they haven't started drinking, so they can not have to deal with the car after the reception). Of course the alternative is to provide transportation between the various locations, but I looked into this and it was really expensive, so I understand if you don't want to do this.

As a separate recommendation - I decided to have my ceremony and reception at the same venue, simply because it saved me a TON of money. It was more money than I thought once I started looking into various rentals or decor costs that couldn't be shared if they were at separate locations.

30 minutes max, including traffic.

As a guest, if I was driving myself, 30 minutes would be the max I would tolerate. More than that, I would either decline altogether or only show up to the ceremony. Driving is a chore, and I am not going to willingly drive for more than half an hour to get to a reception venue.

If I was not driving myself (transportation was provided) I would tolerate 45-50 minutes.