Recharging a battery takes time, lots of time.

Recommended recharging rate is not more than Capacity/10, so 6 amperes will require 12 hours or so to recharge a 60 amp-hour battery (72 amp-hours input, less losses in efficiency) so you can't just clip on a charger and crank away after a minute or so.

Using heavy cables to 'jump' a battery is faster and more convenient than replacing the 'dead' battery because you have amps immediately available from the good battery and can start the engine, but you are not recharging the dead battery. It will then take time to recharge the dead battery.

A battery that has been completely discharged never regains its full capacity, so plan to replace it when you are financially able.