Really depends on how long you are going to be running the engine for. On my slightly larger hit & miss engines the crank bearings need very little probably one drip every few mins at the most, pistons seem OK on about 1 or two drips per min again the weight of the oil will affect the drip.
I have also done greasers rather than oilers on cranks and they will run 5-10 mins without touching quite happily.
You can also add a bit of WD40 or MMO to the fuel which will reduce the need for cylinder oiling