How often are suwariwaza and hanmi han dachi practiced at the dojo you go to?
not enough. I try to get at least 20% of hanmi-handachi suwari waza in a month, but more or less it gets diminshed. I once was with Yasuo Kobayashi (8th Dan,Shihan) and he was of the opinion that we now practice less suwari-waza and more buki-waza than he and all his peer group did. That in the 50's and 60's it was the other way around. Although my instructor was about 40% suwari-waza in class. So personnally my skills in seated technique are rusty.