Not so BA
What matters is whether or not you can make use of it.
If it were really true all we need do is wait until we see it appear then start betting.That may be sometime but I think it would be less than real's 12 / 16 hour wait for his trigger.
Regarding my experience it doesn't take time at all,the same time I'm arriving at the table,almost immediately I identify such pattern.
Like Palestis said previously,such pattern is not only to hit the same sector for a few times before moves on,a pattern could be also to have a steady movement around the wheel.
For example:last number 23,next number 1,next number 18,next number 3,next number 2...and so on.
How you can exploit such patterns is quite simple,I wouldn't bet with progression but only flat stakes up to a certain limit.
My personal limit is minus 36 units whenever it happens I'm stopping the particular bet and change to another or finish my session.
It happens but till it happens I'm winning more than 36 units.
If for example I bet for a immediate repetition of the same sector and lose the first bet,I bet the new sector,NOT the previous,I just move on to the fresh because not in every sector there are 2 or more consecutive appearances.
One very important thing to consider if you inclined in this betting method is the space/time range.
Time and space are the direct opposite,the larger the sector you are betting (more numbers) the fewer will be the time (bets/spins)
There are many ways like: 6 numbers for 6 times, 5 numbers for 7 times, 7 numbers for 5 times...and so on.
Personally I prefer the balance between time and space and this is being represented better by the 6 numbers within 6 spins.