just wondering in your experiences does it take longer for a plant that has been topped multiple times to show hairs vs a plant that has not been topped?
If you would have said "can", instead of "does", then I would have to say yes, in my experience that can be the case. I pop a lot more plants than I flower, so it's important for me to find the males and females asap and use a scope to locate preflowers. Often the first preflowers appear near the top, if that top is much taller than the branches (strong apical dominance) they will usually be there first, and if you remove that, you change the hormone balance causing it to rebalance. It needs to accumulate enough flower hormones over time. If you remove the part where it accumulated the most (leaves...) it CAN indeed cause a delay.
So depends on where and when you topped it. And since you mentioned "topped many times", yeah, if you remove the tops and hence leaves and the part the preflowers appear first, continuously, I'm not surprised you don't see any signs yet.