We've done a few longer road trips -- the longest one being about 350 km. I think it's safe to say that you need to plan to double the amount of time it would normally take you to get there (at least with our 30 KWh Leaf). However, I'm in my 50s and we also take my mother in law who is in her 80s, so... bathroom breaks are necessary anyway :-)
We drove to Takayama and I think we needed to stop 3 times to charge up. One positive is that there are charging stations on all of the toll roads as far as I can tell -- at least where we live. We stopped for breakfast, then stopped for the toilet and some omiyage shopping and then stopped for lunch. It seemed pretty natural.
On the way back we decided to take the non-toll roads for fun. It's a bit stressful, to be honest. There are actually lots of charging stations, so it's not really a problem. However, they are in weird places and the Navigation unit sometimes has some pretty strange ideas of the best way to get to the charging station. I'm still slowly getting the hang of setting up way points in the navigation unit on the Leaf -- the UI is absolutely horrible. But it can be done and I think once I play with it some more it won't be so bad.
I think the best thing about the experience was stopping in tiny towns that we would never have seen. To be honest, as a kind of lazy tourist trip, the 30 minute charging time is too short. Pretty much every time we stopped we felt rushed and had to get back to the car. I suppose in reality out in the mountains nobody drives an EV so we probably didn't need to worry.
All of our road trips have actually been in the mountains because we wanted to get some experience with that. It's kind of shocking when you are going uphill to realise that you probably won't even be able to do 100 km before you have to stop. But then on the way down it's just coasting all the way. For example, we went up to a small town near mount Fuji and had to stop 3 times to get up the mountain. On the way back we went nearly 300 km without stopping :-)
Anyway, I hope that gives you some idea. My biggest advice for anyone getting an EV is to definitely get a navigation unit that allows you to navigate to the charging stations. I can't remember if it's an option on the Leaf, but for road trips or going places that you've never been before, it's practically necessary (there are mobile apps, but it's stressful enough trying to juggle it without having to worry about dealing with your mobile while driving!). The other thing is we have a subscription for recharging which costs 3000 yen per month. It's a no-brainer for us since we can't recharge at home, but if you want to do any travelling, it's pretty much essential. For us it means we pay only 3000 yen (about $30) a month for fuel, which is practically paying for the car (we bought it used). We also got in on a deal that for the first 2 years we get 3000 yen worth of JCB gift certificates (which are accepted practically everywhere), so we essentially get free fuel for those 2 years.
In the end, it really depends on lifestyle. My wife is the busy, busy, go, go type of person, but I'm hugely laid back. I recharge the car almost every time because I enjoy relaxing and programming for an hour every couple of days. When we travel, I don't want to get there as soon as possible -- I want to relax and enjoy the journey. It suits be very well and even my wife says that she's happy we got an EV. I asked her if she would do it again if she had the chance and she said yes, so I don't think we'll ever go back to an ICE. However, I don't think it would be for everyone -- at least not until the rush mentality of our culture calms down a bit. YMMV ;-)
