Pause every 25th URL being scraped using Power Query - powerquery

Question

I'm scraping a website with different URLs (about 1000) and only able to get 25 query due to website limitation (of course!). I have used Function.InvokeAfter with Number.RandomBetween but no luck.
However, I found that if I wait/pause about an hour or so after the 25th URL, I could query again. Now, I would like to automate that part.
I created a column called Wait with a value on every 25th row on the URL_List table with a number between 60-90 so that every 25th URL, I can have it wait 60 to 90 mins but I don't know how to implement. If I could replace Number.RandomBetween(10,20) with Number.RandomBetween(10,[Wait]). Or also open to other ideas.
Here's what I have done so far:
Function for fGetResults:
let Scrape=(URL) =>
let
Source = Web.Page(Web.Contents(URL)),
Data0 = ()=>Source{0}[Data],
#"Transposed Table" = Table.Transpose(Function.InvokeAfter(Data0, #duration(0,0,0,Number.RandomBetween(10,20))))
in
#"Transposed Table"
in Scrape
Query:
let
Source = Excel.CurrentWorkbook(){[Name="URL_Table"]}[Content],
#"Added Custom" = Table.AddColumn(Source, "Custom", each fGetResults([URL_List]))
in
#"Added Custom"
Merci beaucoup...
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UPDATE
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I did some more digging and found this and this. Instead of a Wait column with a number from 60-90mins after 25th URL or so, I just place a "yes".
WaitMinutes function:
let
Wait = (minutes as number, action as function) =>
if (List.Count(List.Generate(() => DateTimeZone.LocalNow() + #duration(0,0,minutes,0), (x) => DateTimeZone.LocalNow() < x, (x) => x)) = 0) then null else action()
in
Wait
Now, I tried it but is now giving me an error Token Comma expected at the then statement on the New Query, any thoughts?
New Query:
let
Source = Excel.CurrentWorkbook(){[Name="URL_Table"]}[Content],
#"Added Custom" = Table.AddColumn(Source, "Custom", each [Wait] = "yes" then WaitMinutes(Number.RandomBetween(60,90), () => fGetResults([URL_List])) else fGetResults([URL_List]))
in
#"Added Custom"
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UPDATE2
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I think I found the issue. Simply forgot the "if" on the if-then-else statement. The only thing is, there maybe a more elegant solution for this but this works for now. Let me know if you have a more efficient solution. Thank you.
let
Source = Excel.CurrentWorkbook(){[Name="URL_Table"]}[Content],
#"Added Custom" = Table.AddColumn(Source, "Custom", each if [Wait] = "yes" then WaitMinutes(Number.RandomBetween(60,90), () => fGetResults([URL_List])) else fGetResults([URL_List]))
in
#"Added Custom"
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UPDATE3: SOLUTION
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More problems, I think my usage for minutes is not correct but followed exactly what the website said and used seconds and removed the random function on the Query.
WaitSeconds function:
let
Wait = (seconds as number, action as function) =>
if (List.Count(List.Generate(() => DateTimeZone.LocalNow() + #duration(0,0,0,seconds), (x) => DateTimeZone.LocalNow() < x, (x) => x)) = 0) then null else action()
in
Wait
Query (15mins seems to work which is same as 900sec):
let
Source = Excel.CurrentWorkbook(){[Name="URL_Table"]}[Content],
#"Added Custom" = Table.AddColumn(Source, "Custom", each if [Wait] = "yes" then WaitSeconds(900, () => fGetResults([URL_List])) else fGetResults([URL_List]))
in
#"Added Custom"