You can use to a T or to a tee to mean perfectly or exactly right. For example, if something suits you to a T, it suits you perfectly. If you have got an activity or a skill down to a T, you have succeeded in doing it exactly right. (Collins) Suit TO a tee - For clothing : That shirt is perfect on you. The colour suits you to a tee. Regarding time, the post above explains the usage. Basically, the suggested time is good for me. I usually say, "That works for me," but that can be replaced by, "That suits me to a tee," regarding a suggested time. Hope that helps.