Hi qyc88,
you can of course build a simple capacitor/resistor
charge/discharge circuit using only a few discrete
components, but the accuracy is poor.
If accuracy is not an issue, merely that the unit
operates at "around 1 hr" as you put it then an
fet based circuit similar to the one shown below
should suffice.
I made this a few weeks ago, its drawn mostly from
memory, i made very few notes about it, this version
gave me about 30 mins as i recall.
to increase that to an hour, try doubling the cap,
the 1.5 k is the component that will mainly affect
the lit time of the led.
I used a BF244 fet transistor, but any normal fet
should be ok, but check the gate control direction
with this one, lowering gate volts below source will
progressively close the device, that is normal.
With some types, raising gate volts above the source
will progressively open the device, not so normal
but thats ok, just a different type, and wont do for
this circuit. (there are other variations too)
The SCR can be almost any small type.
The charge curve is a straight line, which means its
better than you would think at consistency, but no
where near as good as oscillators with counters.
Best of luck with it, John