It will come back at the same speed it left. If it left at 2 mph, it will return at 2 mph. Actually it could come back in 45 minutes, it taking 1-1/2 hours for a complete orbit of the ISS.
I don't get it. The ISS takes 90 minutes for an orbit. Stopping a bolt dead in its tracks would mean a difference of 17,500mph between the bolt and the ISS which would work out to the 90min flight. OTOH, if both continued - the ISS at 17,500mph and the bolt at 17,498mph, wouldn't it take a year and a half for both to return to the same place of longitude?
(17500*1.5=26,250)/2=13,125 hours
/24=546.88 days
/365=1.50 yrs