So you keep changing what you are saying. You say 2-3 days and you say 2-3 recharges/day, so that needs 3x3x2900*3/2=39150mah so you’d need two 20000mAh powerbanks. Each would probably need fast recharging given the energy input.
You then mention durability. Well two 13000 is safer than one 20000 as if one of them broke you’d have the other. 20000 is heavier than 13000 so 20000 is more likely to break. If you actually needed 20000 and you wanted durability you’d go with 2 10000 as if one 10000 broke you’d have the other 10000.
So you see the problem asking for advice and giving vague or contradictory or changing requirements…
The recharge problem is the main difference across all these 20000mAh powerbanks, how much time they take to be recharged. So knowing actually what problem you are trying to solve is key to getting good recommendations here.
All Anker products are good quality. Their price varies over time.