There is no specific recommendation for maximum file sizes as this depends on how your time-out parameters are set, your server resources and network (also tunneling policies). The fact is the higher the filesize the more risk you run in unreliable uploads. Compressing files before uploading is a good practise for larger files.
These are the same issues which you would run into if you for example upload to a sharepoint site or even a copy on a shared drive, it all depends on the same parameters.
Tunneling policies could also affect your performance as it will limit the upload speeds according the priority set on certain network activities and if it limits your bandwidth you run in the risk of time-out so as you see there is no straight answer to your question. I know customers who can without no problem upload 150Mb files and others who already have issues with 50Mb.
Unfortunate, as I do not know your architecture and infrastructure I can only advice to stresstest the conditions of 150 Mb uploades with several user ids and see if you get time-outs or if it degrades the network performance. One of the questions you should ask your business is how frequent are the occurences of 150Mb+ uploads and if it is the appropiate way. It could be that these are very rare and in that case you could ask them to do this outside the busy hours of the network which will provides you less risk in problems.
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