An easy way to make my animated characters eyes blink frequently

Hey
I'm making an animation movie, with a character that is in almost all the scenes.
To make him more vivid I want to make his eyes blink frequently. I made an eyelids object I can
cover his eyes with, so it looks like they are closed.
I would just put the eyelids on manually a lot of times, but I'm guessing there is an
easier way.
Can anybody help med out?
Regards, Christian

Great thanks!
I found this expression to put on the opactiy of the eyelid:
minSeg = 2.0;
maxSeg = 5.0;
blinkDur = .5
seedRandom(index,true)
segStartTime = -random(minSeg,maxSeg);
segEndTime = segStartTime;
i = 1;
while (time >= segEndTime){
i += 1;
seedRandom(i,true);
segStartTime = segEndTime;
segEndTime = segEndTime + random(minSeg,maxSeg);
if (time > segStartTime + blinkDur) 0 else 100
My problem is that I want to work in a 1 second walking loop I have made.
I tried to tweak the minSeg time to 0.1 but that makes it blink in predictable way.
Is there a way to make him blink randomly within this 1 second loop?

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