Here in Oklahoma 3 years is a common lease term. I personally prefer 2 year leases and offer an option to renew for 1 year at the same price(if the don't drill you get paid twice for 1 lease
) Anything over a 3 year lease would be at a premium price. Current leases are running in the $300 to $400 an acre range. Leases do NOT automatically renew unless you sign for that option in the contract. Setback from buildings, use of roads, feilds you want avoided, and % mineral interest paid are all negotiable items. If you are concerned about something bring it up, if they want the lease bad enough the will work with you. Watch the mineral interest clause, many companies want to pay 1/8, but will pay 3/16 if you push a little. So far I have had very little trouble with site cleanup. Most companies don't want the hassle of messing with a mad landowner so they do a pretty good job.
Are they drilling deep wells or for shallow coal(methane) gas? If the primary focus is shallow you can also put in a depth clause for depths deeper than that to keep deeper depths open for a later lease.
If you have any questions on a lease, it would pay to consult an attorney before signing. Your state laws may have some differences. Talk to your neighbors in the same section and negotiate as a group if you can or at least keep tabs on what everyone else thinks. Of course somebody will always get anxious for the money and sign first.
Usually then that sort of sets the price for your section or area because they have a solid number to work from then. If you don't sign you can get "pooled" so the company can drill anyway.
On payment they usually pay the lease payment by draft. 30 business days is common. My last lease I negotiated a 10 day draft for payment. I have also been paid by check, but it isn't really any faster that a draft in most instances.
BTW, if they don't want to negotiate the roads and setbacks ect.. and say that they will handle that when they drill when they are negotiating damages, don't believe them. Damages is a seperate negotiation and property concerns need to be in the lease. If they are in the lease then they must follow the lease terms or pay enough $$$ to satisfy you to do something else in the damage phase.
Most of the stuff people scream about on eviromental damage is just BS anymore. In the early 1900's most of the bad stuff happened and went on regularly. Anymore there are enough regulations to keep things in check. Now if we could get the envirowackos to shut up about some of this they could actually drill the North Slope in Alaska and then we wouldn't be giving all our $$ to the middle east and Hugo Chavez.
Good Luck.