In theory 170 Ah/14A = 12h.
In practice some of the charge power is lost due to limited efficiency of the charging process, you will need 110% - 120% of charge, thus the charge time is more like 14h - 17h.
Assuming charge current is stable at 14A, but usually it decreases with rising voltage of the charges battery, so charge time will be even longer.
See also http://www.mpoweruk.com/chargers.htm