Most telerad gigs will try to sell you on a longer shift, but you can negotiate or find jobs for shorter periods of time. 1-2 hours might be a stretch, unless it's work you pick up in addition to more regular and longer shifts. 4-5 hrs is often a reasonable evening shift for moonlighting.
Some work is study based rather than time, so they send you bundle of exams to read. How long it takes it up to you.
Telerad is going to be more in the range of 200-350, but will vary significantly on who you are working for/with (a PP group, hospital, telerad corp). All of those options come with various positives and negatives.
Onsite locums pays significantly more, but depending on where you are stationed it may include a decent amount of travel. If you want to do more than burn a weekend, it also involves sacrificing leave.