The activity updates every 1 hour (I suppose).

Pretty much this.

As long as mine goes up by 14 every other Tuesday that's all I care about. I couldn't care less about the exact time in minutes & seconds etc.

This ^^

I think I saw a time once when it didn't update till the next day, although I concur it may be my browser cache.

It wasn't blank, a new sheet was created and moved to the front so at first glance there were only 1's visible.

I just edited the sheet to bring the time stamp list back to the front.

All activity times until 2060:

https://docs.google.com/spreadsheets/d/12saLhlUoqIdairxzuSPu6EYGrt7FN2lOstO1yDjCEbA/edit#gid=1324892580

Not sure, but I found this interesting. https://bt.irlbtc.com/view/1226681.0

Thank you!

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Interesting...
by looks of it , mogrith is luckist of'em all...

I am completely new to this bitcointalk world, and I didn't understood anything about periods.. In my profile I see that my number of posts equals number of activities. .. Are they different?
And how rank increases, if I completed posting 60 posts, wont I be upgraded to member rank???
 I am very confused...

This,

The activity number is determined in this way:
time = number of two-week periods in which you've posted since your registration
activity = min(time * 14, posts)

is not very clear at all.

Finally, a new member that's got the system spot-on I've seen people try and interpret the system in so many different ways it's funny.