for a while / for a long time
When I use these words, for a while / for a long time, using perfect form is better?

For example.
I didn't study for a while / for a long time.
I hadn't study for a while / for a long time.

And, time of "for a long time" is longer than "for a while?"

Question

for a while / for a long time
When I use these words, for a while / for a long time, using perfect form is better?

For example.
I didn't study for a while / for a long time.
I hadn't study for a while / for a long time.

And, time of "for a long time" is longer than "for a while?"

Answer

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Please help me .. i am waiting. i hope you reply soon. i can not send you messages. so i write here.

Answer

Yes, "for a long time" has the nuance of occurring for a long period of time e.g. months, years etc. As for "for a while" means more over a period of maybe a few hours.

The nuances in your examples are in the following:
I didn't study for a while = I didn't study for a few hours
I didn't study for a long time = I didn't study for months or years
I hadn't studied for a while = I hadn't studied for a few hours
I hadn't studied for a long time = I hadn't studied for months or years.

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