Wolf-
Halachically, one can remove tefillin after “four times kaddish and three times kedusha”. Which means after the kaddish following Uva L’tzion. You are wearing tefillin longer than that, so the praise is deserved.
4 Kaddish- After korbanos, after Yishtabach, after tachanun, after Uva L’tzion
3 Kedusha- In birchos krias shma, in chazarat hasha”tz, in Uva L’tzion.