https://kotaku.com/the-diablo-iii-switch-port-took-nine-months-1828400479

Just so people have an idea as to just how long it takes to port a big game to Nintendo Switch.

This also means a lot of late ports coming to Nintendo Switch this fall/next year probably weren't even started being worked on until sometime after December 2017...

Wow that's a lot of time. And this is for a game that was developed in 2012 with PS3/360 level of hardware in mind.

Well considering that the game has added content, higher native resolution, and a more stable fps than those consoles (as all last gen ports do on switch), 9 months is not really a lot of time.

Your Switch sales prediction was a bust, accept it.  No need to grasp at staws trying to downplay the system.  You are only hurting your own image.

We have no idea of the development team size. If there were just ~10 people, it's quite low, actually. And it's going to sell like hot-cakes, fingers crossed.

Is that a pretty standard amount of time to port a game?

Seems like a long time. It's not as simple as just copying a file over or a 1 week job.

ehh... this really isn't indicative of anything really. At least not with the information given. It heavily depends on things like development team size, team experience, whether systems and assets have to be heavily modified to work on the hardware with stability and at the desired framerate, how adaptable the code code is...

all kinds of things. The truth is, every project is different.

That's the point. Doom on Switch and Wolfstain took almost the same time. While Diablo has been here since 2012 and run easier on PS3 and Xbox 360 that is slightly weaker the Switch. 

Yeah given they are reworking the game for both the docked mode and portable and porting to new hardware usually takes time this isn't bad.

Now Dragon Quest XI assuming they are just porting the PS4/PC release and have been doing so since it was announced that is too long.

I think it varies from game to game. Blizzard might be trying to do the best switch port of diablo 3 possible.

In contrast, Sumo's Snake Pass took a week to port to switch. A lot of developers have said Switch hardware is friendly for porting games over, more so than the Wii U.