Congrats! Toddler nursing is an interesting adventure to be sure! It is also a wonderful way for mom and child to reconnect after a separation - it helps child more than you can imagine.
On to my nursing experience. I nursed my first for only 14 months. Had I known then what I knew with my last 2 kids I'd have nursed far longer - but living with my mother made it very difficult to follow my own child-rearing beliefs and I weaned too early (I was also only 19 when #1 son was born...)
Baby # 2 nursed for 38 months - yes that is 3 yrs and 2 months! We had a more than rough start to breastfeeding and I was determined to nurse him for as long as he wanted - much to the dismay and numerous rude comments by my mother's side of the family. I didn't realize he would nurse through my last pregnancy and take me into the realm of tandem nursing!
Tandem nursing was quite a challenge but well worth it. It took sibling rivalry and threw it out the window! Something I hadn't know would be a benefit. And when my milk came in (with a vengeance!) it was a godsend to have him around! Baby would finish off one VERY full breast and I'd look at the other (ouch!) and look at Ben and say "Hey! Kid! You want some daki??" (daki was his word for nursing - we never could figure out why he called it that...) He'd just laugh and come snuggle in my lap and he felt better and so did I. We didn't lose that relationship just because the new baby had arrived.
A few months of tandem nursing became enough for me and we weaned gently - we tandem nursed for 9 months. During that time he nursed anywhere from 2-6 times a day depending on his day. Towards the end I only allowed nursing first thing in the morning and last thing at night using the "don't ask don't refuse' method and lots of distraction to assist with weaning. :) It worked well.
Baby #3 (PJ) was MINE. :) He was a homebirth baby and was very healing for me in many ways. We nursed for a total of 4.5 yrs. The last year I wanted to be done but a nasty separation made it difficult for him to wean. The extended nursing had strong emotional benefits for him - keeping him more stable than my other two boys. And it had unexpected long term benefits for him and I together - we are still VERY close - he is now 10.5. He remembers nursing with lots of warm fuzzies!
During PJ's last 2 yrs of nursing he would sometimes nurse frequently and sometimes not. It really just depended on where he was at emotionally in his development, and if he was having a rough day (we all have them) or not. If we were really busy, out and about, etc., he would nurse less than if we were home for the day.
Bottom line? Toddlers have varying nursing patterns. There is nothing wrong with nursing a toddler - the other poster made a great point: temper-tantrums seem to be fewer! If a kid has a temper tantrum it is usually because they are extremely frustrated about something - popping them onto the breast is a great way to calm them down and then they feel better and you don't have to listen to a screaming child!
I wish you much enjoyment in your toddler adventures! It is a wonderful time. I wish that many more mom's were able to experience this particular time - it is a joy...
Warmly,
J.