Been making a version of Russian buttercream for over 40 years now. It's a recipe my mother got from her mother. To make it so it lasts longer after piping, use equal parts room temp butter and room temp shortening (Crisco). Yep, shortening. It sounds gross but it tastes wonderful. Everyone who has tasted it LOVES it. The shortening makes the buttercream WAY more stable.
I put my butter out at room temperature n whip it but it does not remain thick as yours. My butter start to become soft. Am I leaving it too long at room temperature? I use real butter (cream milk)
Could you please consider putting the amount of butter at the bottom of the page as you add it? It makes it very difficult to watch and do it at the same time when you have to go through and write everything down first it's just not enjoyable. Thank you