Haven't tried this with a Sciadopitys, Emma.
But I wouldn't risk it, or any other living tree indoors for that length of time.
I'd do a maximum of one week indoors, after a spell getting it gradually accustomed to higher temperatures and then the reverse to get it prepared for going back outside. I'd think a Sciadopitys would be 'too good' to risk , really. Better to tinsel it up and keep it outside on the doorstep, for a classy holiday statement that both looks good and keeps your tree alive.
Sciadopitys are so slow growing it would be such a pit to risk it.