Your visa will reflect the dates as well as number of entries specified on your letter of invitation.
The invitation must bear an official signed seal of the authorized issuing Ministry of the Russian Government.
The visa is usually valid for a 90 stay, but an extension can be requested once in Russia through your hosting organization. (It is best to apply for this extension the day after you arrive in Russia.)
It is recommended that you carry copies of your visa support with you to Russia.
You must register your visa at a local OVIR or Police Station within 72 hours of arrival in Russia.
Embassy requirements and fees are subject to change without prior notice.