3/ It's well established that this has a very bad impact on combat effectiveness. Sustained fighting led to 98 percent of Western Allied soldiers in WW2 becoming "psychiatric casualties" within 60 days. The Russian Army seems to be ignoring this.
https://mastodon.social/@ChrisO_wiki/110589387824639004
Relatives of mobilised soldiers from the 1439th regiment complained recently that their men were being forced to pay bribes of 100,000 rubles to be allowed to go on leave.
https://mastodon.social/@ChrisO_wiki/110584741821869655
4/ The mother of one of the men says that her son has been fighting "for eight months now, without rest, without a rotation. He was taken away at the end of September and we have not seen each other since. In December, after training, he was already in Ukraine, and, as he says, their regiment never leaves the front line."