When I used to run them we had time limits of 2.5 hours per game (from setup to time-up).
I'd make calls every half hour. In the last half hour, I made one additional call at 15 minutes, also instructing "If you haven't started a new turn, DO NOT START ONE."
At time-up, call of "Time is up, STOP PLAYING, DICE DOWN." was made. ALL play was to stop, VP calculated from that point. No "finishing the turn" shenanigans. We also had a large clock, visible to all, showing the time remaining.
I'd also wander around to check that there wasn't anyone deliberately slow playing (penalty of docked points after first warning).
But yeah, dice and model management forms a large part of playing certain armies. KNOW your army, KNOW your rules. If you have a horde army, it's on you to learn how to move them all in such a way as to not waste time.
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