Duration - 7 days Bike ride
Cost - 30000 For bike (twin sharing), stay and dinner (Flights excluded)
Documents - As of now no VISA required, Indian Voter ID / Passport & Driving license. In Phuentsholing you will need to get immigration documents, Its time taking process in govt office and easy if you have agent contact. These documents are checked at various checkpoint in Bhutan.
Currency - Indian rupees is accepted everywhere except 2000 Rs Note. No need to get currency exchanged. you can have some as souvenir.