I agree with my colleagues. It depends on a lot of factors, not available here. Weight, prior criminal record and so on. It could be a mandatory minimum offense, and prior drug offenses could double the mandatory minimum. There is not enough information to answer your question.
This response does not create an attorney client relationship and is offered for informational purposes only. Only a lawyer fully versed on the facts and circumstances of your case can properly advise you on the case. I am licensed to practice in Minnesota, not every state. You should always consult with an attorney licensed in your area on how best to proceed.
There is not enough information here to accurately answer this question. The federal sentencing guidelines take numerous factors into account such as criminal history, role in the offense, weight of the drugs, etc. Just be sure to hire an experienced Federal Criminal attorney to guide you through.
As my colleague said, you've not provided enough information for us to intelligently and accurately answer your question. There are too many variables. The maximum possible penalty is generally irrelevant since the sentencing guidelines usually dictate a much lesser sentence (though not always). The maximum sentence for conspiracy to distribute marijuana is life in prison. Again though, that is not typical and the actual sentence imposed depends on many things, including but not limited to the amount of marijuana involved. For more "general" information, see the link. But this is just one piece of the pie as the sentencing guidelines and other statutes will/may apply.