This is entirely dependent on the complexity of your product/solutions offer. You do not necessarily need to be involved in the proposal training, however your involvement in training should be to educate the bid writer on your business, your offer, etc. therefore your time investment can vary. The actual training on best practise bid process and rebids etc is on us. There may be some ancillary requirements for you to be involved, but I wouldn’t anticipate that being more than an hour or so per week.