Glossary entry (derived from question below)
inglés term or phrase:
Timely Filling
español translation:
presentación dentro del plazo previsto/correspondiente
inglés term
Estados Unidos
Also a researcher in nutrition
Native in: español 
Works in: inglés al español, italiano al español
Timely Filling
This is the title of a letter to request an appeal to a medical insurance.
Translation Sample Letter
" Timely Filing"
It was translated as Presentación oportuna, but I am not totally convinced
Thanks much!
Apr 28, 2020 15:08: Marta Moreno Lobera Created KOG entry
Non-PRO (1): Wilsonn Perez Reyes
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Proposed translations
España
Sworn/Legal/Business, +20yrs, APTIJ
Native in: español
Works in: inglés al español
presentación dentro del plazo previsto/correspondiente
Clear and High Quality Translations
Native in: español 
, francés
Works in: francés al español, inglés al español, francés al inglés, and 2 more.
completar respetando los plazos
I interpret that this refers to an indication at the beginning of the letter, asking to fill it respecting the delays. If you have more information on where this sentence appears in the letter we can look for the most adequate translation.
"Completar el formulario respetando los plazos establecidos"
"Que la mencionada adecuación debe realizarse en forma gradual, respetando los plazos establecidos por la Ley Federal de Educación"
Estados Unidos
Don't just say it, say it right!
Native in: español , inglés
Works in: inglés al español, español al inglés, inglés, and 1 more.
someter según el plazo indicado
| Muchas gracias! |
México
Confianza, certeza, creatividad.
Native in: español (Variant: Mexican)
Works in: inglés al español, italiano al español, francés al español, and 6 more.
Discussion
2) "Timely" is finely translated as "oportuno", i.e. "dentro de plazo", so I do not quite understand your misgivings regarding "oportuno". I personally prefer "dentro de plazo", but "oportuno" is not wrong.
https://books.google.es/books?id=zAo5X7gfcGUC&pg=PA40&lpg=PA...