Many chillis, especially those that are widely commercially grown, have a known lead time from potting on till fruiting. Potting on is at the point where you have a seedling with two pairs of true leaves. I think you can find varieties with as little as a 60 day lead time, though 75-90 days is more common. The more exotic varieties favoured by hobbyists tend to be the longer period types. I can't just now locate the chilli seed site I used to frequent that had these stated fruting periods, where known.

Typically it will take you another couple of months to get from a seed to potting on time, so you have an absolute minimum of about 4 months from seed to fruit. So planting seen in mid-June is nonsense.

Trouble is these stated lead times are for chillies grown with the light intensity and warmth routinely available in places like the US southern states and Mexico. In cooler climes, it takes longer, unless you can give them supplementary warmth and, more importantly, light. That is why hobbyists in cooler climates hoping to get fruit off their orange habanero, or whatever, set them off in January hoping to get fruit by October, or go to trouble to overwinter them to get them going early the next year.