the roadmap doesnt help you figure out how much time we need. the roadmap is just a guide. Market Makers will tell us about market conditions and development time 
Anyone who wants to HODL should always make plans ahead of time hence here roadmap might be a handy. I am saying this because you have to target when the market falls and invest your money at that cheaper rate while you then begin to wait for the price to increase. If not like then you will be taking bigger risks. Some people make the mistake of investing at the peak price or something close to that and before they know whats happening the price is already going down and they are losing their money. So anyone that is interested in HODL should always plan ahead of time so they dont miss out.To hold on for longer i hold cmc where the top altcoins encourage me more.
Everywhere CMC acts as a helpful reference hence no wonder for guiding us for deciding which coins for long term holding. Still, I personally advice anyone to go with only bitcoin when it comes for "real long term" like for decades.