How Long 'til Crunch Time?

There are                                      72 pixels/inch
and                                            12 inches/foot
and                                         5,280 feet/mile

so there are    
                                        4,461,920 pixels/mile

The universe is 40,000,000,000 light-years in diameter. With the speed of light being

                                          186,000 miles/second

and a year being 60 second/minute * 60 minute/hour * 24 hour/day * 365 day/year

or 
                                       31,536,000 seconds

That makes a light-year

                                5,865,636,000,000 miles  (5.8 trillion)

or

                       26,758,835,896,320,000,000 pixels (26 billion billion)

So a line spanning the width of the universe would be

        1,070,353,435,852,800,000,000,000,000,000 pixels (1,070 billion billion billion)              

With each pixel representing 20,000,000,000 years

or
                          630,720,000,000,000,000 seconds (630 million billion)
we will need 
                   10100 / 630,720,000,000,000,000 
or

15,854,895,991,882,300,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 pixels

Which would make the line

14,812,766,942,958,400,000,000,000,000,000,000,000,000,000,000,000,000 

or 

14 million billion billion billion billion billion

times wider than the universe.