A buyer with narrow criteria in a tight segment often sees fewer homes simply because fewer of them exist, while a buyer open to several neighbourhoods or property types naturally has more comparables to walk through before one feels right.
What matters more than a count is having financing pre-arranged before you start, so that when the right house does appear you can write a competitive offer with a real financing condition rather than scrambling to get approved first.
The right number of showings is however many it takes to know a comparable when you see one. Get your hand-reviewed valuation from Joel Dyck.