Hi Alberto,
I am not 100% sure I understood all your questions but I'll try (and say it in spanish after):
With a "pro" account you can upload 10 photos per week. These do not accumulate (if you don't upload anything during a whole month, then you still only have 10 slots to use). A "week" means 7 days and doesn't matter if it is Monday, Sunday or anything.
To know how many pictures you can upload at a given point in time is quite simple, just ask yourself (actually the site will tell you) how many pictures you already uploaded in the previous 7 days:
If you uploaded 10 pictures in the previous 7 days (doesn't matter if it was 10 in a row 6 days ago, 10 in a row yesterday or any combination) then you cannot upload anymore. If you uploaded, for example, 6 pictures in the past 7 days, then you can upload 4. Or you can upload just 1 and be sure that tomorrow you can upload at least 3...
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Y te lo escribo ahora en espanol (pero sin tildes ni demas signos que no tengo en este teclado):
Puedes subir 10 fotos por semana. Por "semana" se entiende 7 dias consecutivos, da igual que sea empezando un lunes, un jueves o un domingo. Es relativamente sencillo:
Hoy puedes subir 10 menos la suma de todas las que hayas subido en los ultimos 7 dias.
Y no se acumula: si no subes nada durante un mes, sigues pudiendo subir solo 10 fotos.
Saludos,
paco.