Oh I'd say it depends!! If I'm making an insane effort like this one id say a good 30 mins up to 1 hour, 2 if I'm too mentally blocked !

Then to make all the rentry I do it throughout the day and since I'm in phone it takes me longer than in pc, I'd say a good 2 hours , 3 if I'm too busy. I put everything in a layout, place the images and symbols I want, then I manually download those images and edit them to have the same colors as the rentry, reinsert and yeah !!