Since you still want to cut fat, I would recommend 40-50 mins of cardio 4X, maybe 5X per week, done at variable intensity levels, either first thing in AM or right after your lifting session. Many people prefer to do cardio on non-lifting days only. Intensity levels are approx: LIT 60-70 % of max (220 less your age X60 or 70%), MIT is about 70-80% and HIT 80-85%. You can either buy a heart rate monitor or most cardio equipment have sensors in the handles, although they can be inaccurate. I would mix up the cardio - do intervals one day ( 2 mins fast paced HIT followed by 1 min slower LIT pattern) LIT the next day or after a lifting session, then maybe HIT the next day, etc. the settings on your treamill will vary from person to person in regards to heart rate. For example, I may have to set it on high incline to get heart rate to desired range and you might just need level but at higher speed. Cardio, when done consistently, has many benefits, some of which are obvious like a healthy heart and CV system, and non-obvious such as improved blood oxygen levels which help you with intensity levels while lifting, especially with legs, and you will recover faster from lifting sessions.

PS - congrats on your weight loss so far
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My favorite part of lifting is having the opportunity
Current Stats:
Weight 207 lbs
Height 5'9" Signature Lifts: Squats & Deads
BF% 14 Goal