My take is on a cold start your symptom sounds not super normal unless the ambient temp is really low with 15/50w oil. In a situation I.e. during a ride from a stop light and you stall this sounds normal as the motor is hot. This happened to me on a couple of occasions. My charging system, etc. is fine as well.
I have noticed this slow starting behavior almost since new, even though every time I start my 2014 the ambient temperature is at least 55°F or higher. I also keep the battery at what the Battery Tender considers "full charge" (green lamp after a few minutes).
I purchased the bike new in April 2014 and it is on its original battery, with about 3900 miles on it.
Mines (1200R) been struggling a bit now the weather in UK has got cold, even though the bike is stored in the garage.
It's not so much the turning over, more the initial cold running - need to hold the throttle once it's caught as it runs 'a bit rough' and won't keep going until a bit warmer without me helping it. After about 20-30 seconds, all's Ok.
I'm on the official Ducati battery conditioner as well and voltages / charging is all fine. Just doesn't like the cold - never been an issue since I had it from April.
Assuming that question was for me, I'd say I average one start per week during warm weather months. I have seven other bikes and ride them all on a more-or-less regular basis.
But I never take any of them out for less than about 60 miles at a time. Also, should one of the bikes sit for more than a couple of weeks, I hook up the Battery Tender until the light switches to green.