Thanks again Panoramix & Mike, I'll forget the times for a while then and concentrate on technique. To be honest, I'm not trying to break any records, just passing time while my daughter's in the pool and it's no good killing myself in 10 mins on the rower because I have 1.5 hours to pass. However, having read this thread I thought I should try to get more value from my time on the rower.
Anyway, thanks for your patience with me going over the basics, I can see that this thread has been going for a while and you've all moved on beyond this stuff so I appreciate your advice.