Does Turkish Delight have to be this difficult?
I've just had a go today. I only stirred until all the lumps of cornstarch lumps had gone, about 20 mins. It was getting very thick then! Note that the lemon juice with the sugar and the cream of tartar in the cornflour mix will convert some of the sugar to invert sugar, which is supposed to help reduce the growth and size of sugar crystals (I learnt about this whilst making fudge, which starts with the same sugar heated to softball stage, and marshmallows, which are like the Turkish delight mixture if made with gelatine, just whipped to incorporate a lot of air.) Overall the process is quite simple, as you say, it is time consuming. Good luck with future trials. Chris