Steve is correct. There was no variation from the time the yellow tips were first introduced. The tips were, of course, a safety warning, to assist in the reduction of casualties, mainly fatal, caused by personnel walking into the arc of a spinning prop. (I've seen it happen, and it's not pretty).
A tip colour greater than 4 inches (100mm) can be counter-effective, as the increase in size of the yellow-coloured area can actually diminish the effect of indicating the outer extremity of the prop arc.
However, when the 'modern' variant of white/red/white, or red/white/red was introduced, mainly in order to be more visible on a light silver-grey or polished metal prop, then the depth could be increased to six inches, depending on the span and chord of the prop blade(s).
On propellor aircraft used by the RAF for Air Cadet or University Air Squadron students, post war from the 1970's, the warning effect was increased even further, by having the entire front face of each prop blade finished in black/white bands the length of each blade, the reasoning being that such 'pupils', being young and not accustomed to the environment of a 'live' airfield, could possibly be more at risk.