Loss on drying (NAC)

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winzzz
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Loss on drying (NAC)

Hello

Acetylcystein
In USP : Loss on drying : Dry it at a pressure of about 50 mm of mercuric at 70 C for  4 hours: it loses not more than 1.0% of it weight

I have only hot air oven / don't have vacuum oven.
I can use hot air oven intead vacuum oven ???? 
If I can What  status  as pressure of  about 50 mm of mercuric at 70 C

help me please , thank you very much