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It doesn't have to be super difficult. I'm aiming for similar, which is about 10% of my bodyweight. Aiming for a patient and sustainable approach of about 0.5kg a week, which means a deficit of 500kcal-ish a day. If you've got more capacity for misery I think you can safely go up to 1kg per week but obv that means a hefty deficit BUT sometimes that's easier to take when you know it's going to only last 7 weeks.
"it depends" I guess
Realistically how hard is shifting 7 kg?