How we cite our quotes:
MACDUFF Hail, king! for so thou art: behold, where stands The usurper's cursed head: the time is free: I see thee compass'd with thy kingdom's pearl, That speak my salutation in their minds; Whose voices I desire aloud with mine: Hail, King of Scotland! (5.11.1)
When Macduff says "the time is free" he means that Macbeth's reign has come to an end and the people of Scotland now live in freedom from tyranny. But there's also the sense that time had somehow come to a halt when Macbeth murdered Duncan and became king. Now that the rightful heir, Malcolm, will be crowned monarch, linear time (which was disrupted by Macbeth), is back on track, just as lineal succession (also disrupted by Macbeth) is reestablished. And—this might be a stretch, but you know who else is now free, or almost? The audience. Their time is back on track, too. Given how much Shakespeare liked to talk about plays and acting, we think it's a reasonable interpretation. Do you buy it?