It appears that there's no expiration time for transactions...
- You might want to add a 5/10 minutes window limit for depositing
["to an extent" helps with accurately estimating the outcome].
We are working with the biggest exchanges and our algorithms can easily handle large amounts. We'll try to explain it better.
The main issue isn't your algorithm but those exchanges usually have certain limits
[they tend to block unusually large transactions and ask for further proof in regards to its origin and when that happens, it usually takes them more than a month to process it]...