Two hours should be fine. You did not say what the aspect ratio of your video and photos were. For 16x9 use Smartfit. For 4x3 There are 4 quality options which allows more than 4.5 hours.

I answered just a few minutes ago and the forum timed out so I am answering again.

Please keep in mind, the norm is 1 hour of high quality DVD video on a single layer disc.
The more you cram onto the DVD, using Smartfit, the lower the final quality of the video will be.
That's not to say Smartfit isn't a good useful feature, it just comes with a little baggage.
70 minutes would be higher quality than 75 minutes, which would be better than 85 minutes, and so on. HP Envy Phoenix/4thGen i7-4770(4@3.4GHz~turbo>3.9)
Nvidia GTX 960(4GB)/16GB DDR3/
Canon Vixia HV30/HF-M40/HF-M41/HF-G20/Olympus E-PL5.
Tape capture using 6 VCR, TBC-1000, Elite BVP4+, Sony D8 camcorder with TBC.
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Thank you. This was very helpful.