17:00 at gmt -5 on saturday might be bad because I sometimes work from 5-7pm on saturdays, as well as 3-6pm on friday. I think somewhere in the span of 12:00 - 15:00 are usually convenient times. As long as it's before 16:00 I should be good on Saturday
if it sounds too uncomfortable for you, i can play 18:30-19:30 (GMT -5) on mobile, but only at Saturdays