This banner was a pain for me.

At the start I was in The Hague (Statenkwartier), where I could use a bike, every weekend but only in the mornings. Ended up somewhere near mission 5-7 on a place which wasn't accessible (building terrain). Took me at least 15 minutes for this one portal (which had to be hacked twice).
Later I came to the hague less frequent (every other weekend) and the weather got worse (authumn/winter).
Kijkduin was a bit annoying because of the building site but it was done fairly quickly.
Then everything went fine until I came to scheveningen where I was too early at the Pier and it took me more then 15 minutes for a single portal. Later that day I arrived at the construction site where I spend over 30 minutes for a single portal.
At this point I was nearing the end.

The weather got even worse and I didn't feel like continuing the missions. A few weeks later when it wasn't raining I continued in an evening as my girlfriend was working and I was passing by. Almost drove 10km by bike to play for half an hour and turned back. 25KM done for not even half a mission (blehh). Later I had to continue this mission which was the biggest pain for me, starting off with another 8KM bikeride to the start of the mission. Luckily I was able to finish the mission that day and begin fresh the next day.
After this a few more mission I came back to familiar terrain and the remaining part near central station was fairly easy.

Overal I enjoyed going through the missions as it proves I'm a worthy agent.
Started somewhere at the end of the Summer and was finished at the start of december. So it took me 3-4 months of playtime.

Easy

I walked this one! Can't find out the exact time, because my phone lost data in an upgrade ( :( ) but it was LOOOONG.
In total it was a couple of months, but I had to stop in between for 2 months because of an injury.

Depending on how the weather was some missions were nice, others were sheit.
Especially near the beach (I hate sand) it sucked because there was lots of wind that day.

However, at the final portal KiraKage was there waiting with a sixpack of beer to congratulate me on both something amazing and something amazingly stupid.

As one of the makers I am obviously biased, but I am glad I did this.
It gives a real sense of accomplishment. And a LOT of uniques (even I got some)
A banner famous for being hard. Made to challenge.

It took me ~270 km of cycling (useful rule: take the 'Total distance'+30%), but around 5-10 km is probably just backing up and reversing direction because of hack-lag.

The following portals I had trouble with:

• 1.11 is inside a building that was closed on Saturday. You may have to drift to get it,
• 5.13: road was closed for construction,
• 5.25 is on a playground with a fence around it that may(?) be closed at night? Ask locals to be sure.
• 19.69. And then there's the legenday Schateiland. You can reach it through the Pier if it's open(10h-22h). If not, you'll have to get your feet wet (and legs, maybe waist). I was there at 2016-10-18 around 8:30, which according to this this tide chart, at nearly low tide at NAP-20cm. I still had about 1m high water to go through.

Total time for me was 24h50m (including breaks). We're still waiting for someone to do a sub-24h single-run :)

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