The jack should only take an hour or so if it is bolted on, maybe ninety minutes if it was welded in place, assuming it is just the jack. The heater could be either a piping problem or just a bad ignition control card, though I'd bet on the card first.
Not knowing the shop, the chances are that you have only one tech working on your rig and (s)he may be working on three to five other units at the same time. The tech might be the type that works on one problem before looking at the next problem. It might take them a day or so to get the card if they don't have one in hand. I'd give them until Wednesday to call with an update. No update, I'd be calling on Thursday and politely asking how the repairs are going rather than asking when will I get it back. When we had problems with Gypsy I or Gypsy II, the first things that I would ask were how backlogged the shop was and had anyone in the service department recently quit. If there was a bad answer on either of those questions, I'd tell the service manager to buzz me back when they had an update. Luckily, being nice and understanding that there are bad times to bring a unit in for service (October thru February are notably bad times due to retooling at plants and reductions of inventory for tax advantage) can relieve some stress off of the service manager and actually put your unit in front of like to get it out of there. Be nice, be polite but be in touch is the best answer I can give.
