How hard is it to lift 20kg repeatedly all day?

Anonymous
I applied in a Job where we have to carry packages up to 20kg. I have no idea how heavy is 20kg. Now I never been in a Gym. I’m a 5’1ft women and I had an item that is 5kg and I can lift that each of my arms (so 10kg total), I can carry 18kg of water in a box but not for long.

I’m having doubts w the Job but I need a Job and I can't wait for another time for a different Job and on the bright side I might be able to get buff.

I dont plan on going to the gym rn since I need money for it, Im planning to improve it by myself.
How hard is it to lift 20kg repeatedly all day?
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