I would point you to a thread in which I contributed some vague but mildly helpful information about burn times: Which Fire source burns the longest?
And I’d point you at a more comprehensive thread from Pyrite: Zombie Science: How long does stuff burn?
Those were from August and September, respectively, but I don’t think fire has changed since then.
For my money, deconstructing furniture for a bunch of 2x4s usually does the trick. Otherwise I just bash baby trees. The ratio of keypresses/time invested versus burn time is more than acceptable.