Nothing discourages leaders more than when a church wastes their time via the meeting. Some might say financial problems are the big morale killer, but financial struggles can be tolerated for a worthy cause. Even a solid cause can be strangled by long and loose meetings.
My experience with board meetings is that they have lasted on average 2.5-3 hours. My goal in any congregation is to at a minimum, cut board meeting time in half. It's not that the work of a board is not important, but the time cut accomplishes two things. First, it provides boundaries. Second, the boundaries establish that the congregation values and respects the time invested by its leaders. A congregation cannot carry out its mission, no matter how noble and faithful, unless there is trust. One of the best investment in building trust is to respect people's time via meeting boundaries.