They add 0.2 to all tacho time logs on the Decathlons at ACFT. The clock hardly ticks over at all at 1000rpm, so by the time you've warmed up, pre-flighted and lined up, you're lucky to have added 0.1.
From personal experience, you will take longer to learn to fly a tail-dragger as an abo-initio pilot and you will not be able to complete your GFPT or Navs (PPL) in ACFT's Decathlons as they have no Attitude Indicator. Personally, you would be better off learning to fly a Cessna/Piper and leave the Decathlon for your tail-dragger/CSU endorsement and/or EMT/aero ratings - that's what they're designed for. The longer it takes for you to learn to fly, the more money will spend. Soon you will discover you have all these hours on a Decathlon but won't be able to use the same aircraft to get your GFPT or PPL and will have to learn to fly something else anyway.
It's a great plane to fly, but it's not the best beginner's aircraft.