Looking for Tips on how to Jump Start from Spare Battery (for a couple weeks)

Thank you for the advice… as the mechanic just cleaned and fixed up the cables, I’m assuming the alternator is shot and so im not trying to charge the spare battery. Does anyone perhaps have an idea of how many times i can jump the car with a spare battery without charging it? There’s about ten more days minimum till the mechanic opens, and i have to jump it once a day when there’s no one to help push start it. I could perhaps stop by the place where i bought it and ask them to charge it. I’ve used it three times already.