You can upgrade them to level 10 at TH9.
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I'm a TH10 with still around 70 purple walls...
It's not that i think it is hard to upgrade walls, it's that until now i have always foccused on having my builders at work all the time. So i only did walls between two upgrades with what i had available that was not needed for another upgrade.
Now the cheapest upgrade i have is a 6.4M canon, so it's harder to have everybody working. I also have no more building to upgrade with elixir and a labo only working on Dark Troops ATM, So walls are upgraded with any elixir i have.
Didnt do them all i got bored
it took me approx 1 week to finish my skulls back then.
I've been casually farming them for about 2 weeks, and I already have 52 skulls
This is pretty much exactly the way I did it (except the walls with elixir update occurred a week or two after I hit TH8 so I was able to make most of my skull walls with just elixir). I spent the first week or two mostly upgrading elixir buildings and spending the gold I got on the new walls for TH8. Then when all the important elixir buildings were done I started working on gold buildings while spending most of my elixir on walls. All walls were skull walls before I finished leveling all my buildings with all 5 builders active all the time so skull walls did not feel like any real work because they basically took care of themselves (I suppose I probably would have played a little less if there were no skull walls since I would need slightly fewer resources, but I rarely had to play more than I wanted to just to get money for skull walls). My mines and pumps are also not maxed (they are the only buildings I am willing to go to the next town hall level without maxing first).
Skulls were very easy for me too. I only did about 35 of them before the elixir -> walls update, but it was easy before and after the update. I'm very active though.
I find the way the game works to be a little frustrating at times too (mainly because I find myself playing it more than I feel I should). My main issue has less to do with how long things take at higher levels (which is fine) than the fact that you cannot play the game casually. You can't simply raid when you feel like it because you will lose your shield and then be attacked for potentially more resources than you gained in your raid. Thus, in order to get anywhere when saving for expensive upgrades you need to play hours in a row. You can still "have a life" but you have to incorporate touching the screen on your phone every 5 minutes into that life. I don't play clash of clans when I am out, but when I am at home I had to find a way to incorporate touching my phone every 5 minutes into my daily routine in order to progress. I would be much happier if there were a way to protect your resources while still playing casually, but sadly this is very much a PvP game that is entirely designed around stealing the resources of less active players.
About 100 left to make......make a few a night....
I found them easier than i thought it would be
still, i had about 30-50 (don't remember) when the elix for walls came up and took another week to finish them (or so)
now i'm anticipating the lvl9
i'm gonna do a race with snorlaxo when he is ready
if anyone care to join us, we should start the 250 legos farming race in about 3-4weeks (i think)