As said, this is a 'how long is a piece of string' type question....there is no sensible answer.
Those who claim that all their fish come on a certain size/type of bait, if they are honest with themselves, are most probably only expressing their favourite size/type of bait. However hard we try to experiment, when times are hard and we are not catching, we invariable fall back on the bait that bought us our greatest successes in the past.
The obvious end result is a hankering to use that bait within half an hour of the latest experimental bait failing to produce
From then on, we use that bait more than any other...so it is obviously the bait we catch most on
Of course I am only talking about personal experience...I am sure most others are not tainted by such lazy, embarrassing failings themselves
Cheers, Dave.