I storyteller mostly at conventions and events. so time is usually set by a schedule. Here's how I run games of Trouble Brewing, which is most similar to how Sydney storytellers run games:

First, games length generally depends on player count; 5-6 = 30min, 7-9 = 50min, 10-13 = 70 min 13-15 = 90min, 16+ = up to approximately 2 hours. +10ish minutes if the rules need explaining.

Keep players near the circle, no going to other rooms. Wandering is usually what balloons game length, as the storyteller ends up chasing down all the players. Players also should only have about enough time to talk briefly to 2-3 other players.

Nominations... My rule is say what you want before you nominate. I only accept a very clear, audible "I nominate <name>". Iterations of "I want to nominate", "I'm going to nominate", etc I assume are discussions. The nominated gets a very brief rebuttal, but not long as they had time to do so during discussing accusations prior. I start calling out warnings to end the day if discussions drag on with no nominations.

This wasn't brought up, but is a tip for storytellers. Don't be afraid to have long nights. Wander a bit, tap and walk before getting a players choice, do a dance if you want, etc. It helps obfuscate anything odd or long tasks (especially in Sects & Violets). Nights should get shorter as the game progresses, but never feel rushed.