To slow the charging time down to 10 hrs, you must decrease the 700 ma output of the charger! Look up the various methods in doing this.
Time to charge = 1000 mah/700ma = 1.43 hr or 1hr and 0.43 hr*60 min/hr = 1hr and 26 min to charge, confirmed by your answer of "approx. 1 hr and 30 minutes..." above.
To charge the battery in 10 hrs, you must decrease the current from 700 ma to;
1000 mah/x = 10 hr
x = 100 ma
This is based on a 5 volt fixed voltage output of your charger, as you indicated in your message.