Please give us a link to a dictionary in which you found the word "upto". (There are other errors in the sentence but let's start with that one.)
Sorry. "[STRIKE]The[/STRIKE] Processing [STRIKE]of[/STRIKE] your claim [STRIKE]can[/STRIKE] could [STRIKE]last[/STRIKE] take [STRIKE]up to[/STRIKE] until April [STRIKE]thirty[/STRIKE] 30th". Is it correct now?
Just to throw in another opinion, I think it's fine as corrected by Em.The statement seems to be saying that it's a habitual thing. As such, using a specific date doesn't make much sense. Perhaps:
Processing your claim will take from 15 to 30 days.
Or something like that.
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