Due to the stretched-out gaming time of PbP games, a modification of the Attribute and Skill advancement rules needs to be made.

Due to the fact that nothing much happens during Jump time, that's not only a good time to do the studying and training necessary, but various computer programs have been designed to simulate that. As memory became virtually unlimited, all that additional space got filled with various bells and whistles which included training sims.

Picking up a new skill at Rank-0 requires 2 weeks of training.

2 weeks of training is required to raise a skill from rank-0 to rank-1,
2 weeks of training is required to raise a skill from rank-1 to rank-2,
3 weeks of training is required to raise a skill from rank-2 to rank-3, etc.

Maximum # of skills is still equal to Int + Edu. 0-rank skills don't count. Maximum number of ranks for all skills should be three times that.

Advancing Attributes works the same way: 8 weeks to raise Str-7 to Str-8, etc.

I suggest a good way to keep track of your training is to use a decimal notation.

Training to raise Pilot skill from Rank-2 to Rank-3 requires 3 weeks of training, so after the first week, you'd have Pilot-2.1 and after the second week, it'd be Pilot-2.2, and finally after the third week, it'd now be Pilot-3.

Unless something else is going on during a Jump, you can study two separate skills at the same time, or study one skill and train one Attribute, but you can only raise one Attribute at a time.

DOWNTIME TRAINING

If everyone agrees to take the time and opportunity to study/train outside of Jump, you can do that. For the most part, nothing much else will happen while you are doing so on a planet, for instance. It will require the expenditure of credits at the rate of 100Cr per Rank training for as it will involve a more hands-on approach, extra research, real-time training and distractions, all-night parties, etc.