[Phase-1] HIP-70 Establish a Minimum Period for Phase 1

I feel a little bit too ashamed to say that we have no choice but to approve this measure, because we are out of options with the constant double standards. I said it before, HIP-5 is underspecified and it leads to double interpretations that generate too much grinding in governance and it needs an overhaul.
For the time being, this fix will be okay. 48h is the minimum for phase 1, but I would add that it is recommended that the proposals follow the nature of their debates.