I've been really patchy and inconsistent, 5-10 minutes maybe every other day using a free app called Insight Timer.
Would like to be more consistent and at least 10 minutes a day, but scheduling time in never works for me as my calendar is always changing.
Try waking up 10 minutes earlier than you need to of a morning and doing it then. Alternately make it the last thing you do before getting into bed of an evening.