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Since
awhile means “
for a
while”, it is never used with a preceding
preposition, as one is already included. When preceded by a preposition, the correct form is “a while”, as two words, as in
once in a while. Compare “sit with me
awhile” and “sit with me for
a while”.
In dialects using the second sense of the word,
awhile is typically always used to convey such sense; the word is separated as “a while” for the first sense, whether preceded by a preposition or not. Compare “You can sit
awhile” (meaning the person can sit while they are waiting) and “You can sit
a while” (meaning they can sit for a length of time).