I'd suggest to extend the motioning period for another 24 hours. Otherwise just a single day absence from the forum for whatever RL reasons may cost a player his ability to present his ideas to the community.
Thus:
T+00 .. T+24: new motions can be made and seconded.
T+24 .. T+48: motions can be made, seconded and voted on.
T+48 .. T+72: only voting is allowed.
I understand the concern, but what that also does, is makes it more possible to 'sneak' motions in and pass on only two votes more easily. It decreases the time to vote on a motion to a possible minimum of 24 hours, rather than 48.
I'd rather see people miss the opportunity to make motions due to missing the time frame (especially since, at least I, still listed motions made long before the motion period came along... during Org's go... which means the time for motions is essentially the 'official' 24 PLUS all the time before that...They just went unofficially recorded until the official time) rather than see people miss the opportunity to vote on a motion...
your method would hard cap the minimum time to vote on a motion at 24 hours- while leaving
no hard cap on the time to offer motions. I'd rather see the hard cap minimum time to vote at 48 hours, like my listing offers, while cutting the time to accept motions back 24 hours.
Take this scenario:
under your suggested way, I could wait until T+47.9 and make a motion to build Goron and Lav a palace. Lav seconds it immediately. That leave only 24 hours for people to 'catch' us and vote against.
Under my method, the latest I could offer the motion is T+23.9, that would leave 48 hours for people to 'catch' us and vote against.
And under both methods I would still be able to offer motions before T+0. so that time would not be max capped at 24 hours in my method.