If we were to respect a 2/3 months break between regimental tournaments, that means there wouldn't be any major competitions (as in, 1v1s or GFs) for half a year, because the EIC ended early June and with the 2v2 likely to finish in early September, that means you wouldn't be able to start an RGL (or anything else) till November/December which is clearly one of the worse possible timing to start a competition of this stature. You would thus have to wait till January 2022 at the latest to have an RGL happen.
I am not a huge fan of tournament spam (I still remember the Mightypain's era when it comes to such an issue) but at the same time, I do not believe that competitive regiments can afford to spend 7 months without playing an NWL, RGL or EIC in the current scene. Kincaid's series (NWBC & 2v2s) offers from my point of view the required 'break' in the form of a competition that can still be played seriously by the regiments attending them but does not require the same level of competitive involvement and dedication as the aforementioned tournaments. In that regard, I believe a one-month break between the end of the 2v2 and the RGL should be reasonable enough and allow us to finish the RGL before the Christmas / New year period that inevitably coincides with a decline in activity from players.