At 1c a battery theoretically takes 1hr to charge, although often it'll not be exactly that depending on charge level etc.
Whilst you can charge faster on some batteries, 1c is a good rule of thumb for max, anything up to that is unlikely to hurt tje battery but going over might shorten its life.
Divide by 1000
Thats the 1c charging current in amps
At 1c a battery theoretically takes 1hr to charge, although often it'll not be exactly that depending on charge level etc.
Whilst you can charge faster on some batteries, 1c is a good rule of thumb for max, anything up to that is unlikely to hurt tje battery but going over might shorten its life.
On in shorter terms, 1.3amps is fine